Cleanup

[0xjac]

• Code cleanup
• ERC20 toggle events
• Check events in tests
• Improve tests for hooks
• Solidity bum to 0.4.24
• Truffle as a dev dependency
• Add initial supply

[codecov-io]

Codecov Report

Merging #65 into devel will not change coverage. The diff coverage is 100%.

@@         Coverage Diff          @@
##           devel    #65   +/-   ##
====================================
  Coverage    100%   100%           
====================================
  Files          5      5           
  Lines        141    160   +19     
  Branches      26     26           
====================================
+ Hits         141    160   +19

Impacted Files	Coverage Δ
contracts/examples/ExampleTokensRecipient.sol	100% <100%> (ø)	:arrow_up:
contracts/ERC777BaseToken.sol	100% <100%> (ø)	:arrow_up:
contracts/examples/ReferenceToken.sol	100% <100%> (ø)	:arrow_up:
contracts/ERC777ERC20BaseToken.sol	100% <100%> (ø)	:arrow_up:
contracts/examples/ExampleTokensSender.sol	100% <100%> (ø)	:arrow_up:

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