Fixed testcases for PhantomJS syntax.

Updated dist files.

Updated dist files.

Updated dist files.

Update dist files.

Updated package-lock for security reasons; dev dependency only.

Reduce number of HDNode tests which cause TravisCI to timeout.

Added test cases for case-agnostic mnemonics (ethers-io#557).

Fixed testnet exteneded private keys (ethers-io#553).

No longer use hard-coded id of 42 in Web3Provider.