* Add base Context contract
* Add GSNContext and tests
* Add RelayHub deployment to tests
* Add RelayProvider integration, complete GSNContext tests
* Switch dependency to openzeppelin-gsn-provider
* Add default txfee to provider
* Add basic signing recipient
* Sign more values
* Add comment clarifying RelayHub's msg.data
* Make context constructors internal
* Rename SigningRecipient to GSNRecipientSignedData
* Add ERC20Charge recipients
* Harcode RelayHub address into GSNContext
* Fix Solidity linter errors
* Run server from binary, use gsn-helpers to fund it
* Migrate to published @openzeppelin/gsn-helpers
* Silence false-positive compiler warning
* Use GSN helper assertions
* Rename meta-tx to gsn, take out of drafts
* Merge ERC20 charge recipients into a single one
* Rename GSNRecipients to Bouncers
* Add GSNBouncerUtils to decouple the bouncers from GSNRecipient
* Add _upgradeRelayHub
* Store RelayHub address using unstructored storage
* Add IRelayHub
* Add _withdrawDeposits to GSNRecipient
* Add relayHub version to recipient
* Make _acceptRelayedCall and _declineRelayedCall easier to use
* Rename GSNBouncerUtils to GSNBouncerBase, make it IRelayRecipient
* Improve GSNBouncerBase, make pre and post sender-protected and optional
* Fix GSNBouncerERC20Fee, add tests
* Add missing GSNBouncerSignature test
* Override transferFrom in __unstable__ERC20PrimaryAdmin
* Fix gsn dependencies in package.json
* Rhub address slot reduced by 1
* Rename relay hub changed event
* Use released gsn-provider
* Run relayer with short sleep of 1s instead of 100ms
* update package-lock.json
* clear circle cache
* use optimized gsn-provider
* update to latest @openzeppelin/gsn-provider
* replace with gsn dev provider
* remove relay server
* rename arguments in approveFunction
* fix GSNBouncerSignature test
* change gsn txfee
* initialize development provider only once
* update RelayHub interface
* adapt to new IRelayHub.withdraw
* update @openzeppelin/gsn-helpers
* update relayhub singleton address
* fix helper name
* set up gsn provider for coverage too
* lint
* Revert "set up gsn provider for coverage too"
This reverts commit 8a7b5be5f9.
* remove unused code
* add gsn provider to coverage
* move truffle contract options back out
* increase gas limit for coverage
* remove unreachable code
* add more gas for GSNContext test
* fix test suite name
* rename GSNBouncerBase internal API
* remove onlyRelayHub modifier
* add explicit inheritance
* remove redundant event
* update name of bouncers error codes enums
* add basic docs page for gsn contracts
* make gsn directory all caps
* add changelog entry
* lint
* enable test run to fail in coverage
* Add circlci, remove .travis.yml. Fixes#1839.
* Fix circleci config
* Add slack notification
* Add circleci status
* Fix config.yml, we don't need separate truffle image and instances.
* Matches oz-sdk node version
* Seems node:10.13 doesn't work for CircleCI either
* Remove npm update in circleci
* CircleCI use package-lock.json as cache key and install only the lock version
* Add back travis.yml
* Rename job build to test
* CircleCI requires that job to be called build instead of test or build_and_test
* Fix the way to run jobs
* Fix CircleCI
* Change back to npm install
* Add workflow and split into tasks
* Add workspace
* Restore cache
* update readme circleci instructions
* make step name more accurate
* added _safeTransferFrom function
* added safeMint functions
* added package-lock.json for consistency, don't know why it changes
* added initial suggestions/modifications
* change _safeTransferFrom to internal, reverted package-lock.json to original, and changed ERC721Pausable to override _transferFrom instead of transferFrom
* included tests for safeMint functions
* modified safeMint tests to be on ERC721Mock contract
* added safeMint to ERC721Mintable & respective test to ERC721MintBurn.behavior.js
* Rename package and repository name from docs and scripts
* undo root package rename
* add @openzeppelin/contracts as subpackage with release automation
* synchronize @openzeppelin/contracts version
* remove private field from package.json
* make file patterns absolute
* change wording of a comment
* use a saner version script
* Using extcodehash instead of extcodesize for less gas
`extcodehash` uses less gas then `extcodesize`. You can tell which address is a contract by the hash (see EIP-1052).
* Fix
* Add explainer
* Update Address.sol
* add changelog entry
* Simplification and optimization of existing contracts #8888
* Simplification of SimpleToken
* This is the fixed Simplification
* My bad I'm playing around with this git stuff, should be correct now
* add missing parenthesis
