Improvements on develop branch

[pronebird]

Develop branch contains a number of improvements that we may decide to merge:

1. Added eslint script: npm run lint
2. Removed airbnb config for eslint which has unmet peer dependencies (therefore broken). Currently using recommended eslint config + react config
3. Added inline source maps support (breakpoints work in dev tools yay!)
4. Moved store configuration into store/default
5. Added redux-thunk
6. Refactoring

[pronebird]

Merged.