* improve derivation-checking performance by batching docker calls; move into spec dir
* remove npm command to run derivation-checking; create 'int-test' (integration) command and hook up into jest
* add integration testing to CI; configure docker / docker image (dternyak/eth-priv-to-addr) in CI
* docker build -> docker pull
* use travis build matrix to group tests and improve build times
* remove int-test call
* attempt travis 'job' with all tests running in parallel
* remove typo
* attempt travis 'job' with all tests running in parallel (round 2)
* organize integration tests
* refactor/cleanup
* refactor/address comments
* create ensureOkResponse and check against RPC responses
* Merge with develop branch
* added single unit test
* main nodes added
* getBalance method
* remove console.log
* minor conflict fix - readd polyfill to integration test
* added two more method tests
* seperate rpcnode from extended classes
* fixes etherscan
* added all tests
* revert files with only formatting changes
* remove console.logs - still need to update snapshot before tests will pass
* updated snapshot due to RpcNode fixes for Infura and Etherscan nodes
* added RpcNodeTest config so we don't rely on constants in code
* undo formatting changes
* Multiple fixes to error handling tokens.
* Fixed TSC errors
* Minor styling edit - change async func to promise
* changed shape of tokenBalances
* change balance type back to stricter TokenValue type
* remove package.json change and include test for error state.
* minor change removing unneeded line of code
* added longer timeout for api
* update snapshot
William O'Beirne
Daniel Ternyak
Eddie Wang