[FEATURE] Add Wallet class that generates wallets.

[DOC] Comment out logged wallet.

[FIX] Use var instead of const.
Merge pull request #161 from stevenzeiler/wallet

[FEATURE] Add Wallet class that generates wallets.
Fix #160, Seed.parse_json of hex
Merge pull request #162 from sublimator/develop

Fix #160, Seed.parse_json of hex
[TASK] Update package.json for ripple-wallet-generator patch.
Removed node_modules from git repo of ripple-wallet-generator
Merge pull request #163 from stevenzeiler/wallet

[TASK] Update package.json for ripple-wallet-generator patch.
[TASK] add exit_on_error calls to publish script
[FIX] return null for _getServer if there's no connected server