Update to Truffle 4.1.5 and Ganache 6.1.0 (#876)

* Update to ganache-cli v6.1.0 and truffle v4.1.0

* Update to stable version of ganache-cli

* fix: update event emission warning

- Fix event emission warnings for solidity 4.21 after truffle has been
updated to use this version

* fix pr review comments

* update to truffle v4.1.5

* update package-lock

* add additional emit keywords

* update solidity-coverage to 0.4.15

* update to solium 1.1.6

* fix MerkleProof coverage analysis by testing through wrapper

* change version pragma to ^0.4.21

* fix solium linting errors

scripts/test.sh

@@ -7,23 +7,23 @@ set -o errexit
 trap cleanup EXIT
 
 cleanup() {
-  # Kill the testrpc instance that we started (if we started one and if it's still running).
-  if [ -n "$testrpc_pid" ] && ps -p $testrpc_pid > /dev/null; then
-    kill -9 $testrpc_pid
+  # Kill the ganache instance that we started (if we started one and if it's still running).
+  if [ -n "$ganache_pid" ] && ps -p $ganache_pid > /dev/null; then
+    kill -9 $ganache_pid
   fi
 }
 
 if [ "$SOLIDITY_COVERAGE" = true ]; then
-  testrpc_port=8555
+  ganache_port=8555
 else
-  testrpc_port=8545
+  ganache_port=8545
 fi
 
-testrpc_running() {
-  nc -z localhost "$testrpc_port"
+ganache_running() {
+  nc -z localhost "$ganache_port"
 }
 
-start_testrpc() {
+start_ganache() {
   # We define 10 accounts with balance 1M ether, needed for high-value tests.
   local accounts=(
     --account="0x2bdd21761a483f71054e14f5b827213567971c676928d9a1808cbfa4b7501200,1000000000000000000000000"
@@ -39,19 +39,19 @@ start_testrpc() {
   )
 
   if [ "$SOLIDITY_COVERAGE" = true ]; then
-    node_modules/.bin/testrpc-sc --gasLimit 0xfffffffffff --port "$testrpc_port" "${accounts[@]}" > /dev/null &
+    node_modules/.bin/testrpc-sc --gasLimit 0xfffffffffff --port "$ganache_port" "${accounts[@]}" > /dev/null &
   else
-    node_modules/.bin/testrpc --gasLimit 0xfffffffffff "${accounts[@]}" > /dev/null &
+    node_modules/.bin/ganache-cli --gasLimit 0xfffffffffff "${accounts[@]}" > /dev/null &
   fi
 
-  testrpc_pid=$!
+  ganache_pid=$!
 }
 
-if testrpc_running; then
-  echo "Using existing testrpc instance"
+if ganache_running; then
+  echo "Using existing ganache instance"
 else
-  echo "Starting our own testrpc instance"
-  start_testrpc
+  echo "Starting our own ganache instance"
+  start_ganache
 fi
 
 if [ "$SOLIDITY_COVERAGE" = true ]; then