Fix solc-nightly job (#1732)

* update truffle to 5.0.14

* fix setup to test with solc-nightly

* switch to npx in script/test.sh

* please the linter

* rename build to prepack

* move download of nightly build to a compile script

* make compile script executable

scripts/compile.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+if [ "$SOLC_NIGHTLY" = true ]; then
+  docker pull ethereum/solc:nightly
+fi
+
+truffle compile

scripts/test.sh

@@ -39,9 +39,9 @@ start_ganache() {
   )
 
   if [ "$SOLIDITY_COVERAGE" = true ]; then
-    node_modules/.bin/ganache-cli-coverage --emitFreeLogs true --allowUnlimitedContractSize true --gasLimit 0xfffffffffff --port "$ganache_port" "${accounts[@]}" > /dev/null &
+    npx ganache-cli-coverage --emitFreeLogs true --allowUnlimitedContractSize true --gasLimit 0xfffffffffff --port "$ganache_port" "${accounts[@]}" > /dev/null &
   else
-    node_modules/.bin/ganache-cli --gasLimit 0xfffffffffff --port "$ganache_port" "${accounts[@]}" > /dev/null &
+    npx ganache-cli --gasLimit 0xfffffffffff --port "$ganache_port" "${accounts[@]}" > /dev/null &
   fi
 
   ganache_pid=$!
@@ -62,19 +62,14 @@ else
   start_ganache
 fi
 
-if [ "$SOLC_NIGHTLY" = true ]; then
-  echo "Downloading solc nightly"
-  wget -q https://raw.githubusercontent.com/ethereum/solc-bin/gh-pages/bin/soljson-nightly.js -O /tmp/soljson.js && find . -name soljson.js -exec cp /tmp/soljson.js {} \;
-fi
-
-truffle version
+npx truffle version
 
 if [ "$SOLIDITY_COVERAGE" = true ]; then
-  node_modules/.bin/solidity-coverage
+  npx solidity-coverage
 
   if [ "$CONTINUOUS_INTEGRATION" = true ]; then
-    cat coverage/lcov.info | node_modules/.bin/coveralls
+    cat coverage/lcov.info | npx coveralls
   fi
 else
-  node_modules/.bin/truffle test "$@"
+  npx truffle test "$@"
 fi