Invalidate the store at logout, emptying cached items such as artists,
albums and songs and then preventing them from quickly reappearing when
reconnecting with the same or a different account.
Closes#5.
* Keep track of pagination in the store
* Use Immutable in reducers
* Finish i18n, every available strings are now translated in English and French
* Add a loading indicator
* Premises of API error handling
* Better locale negotiation
Also includes misc fixes
* Use CSS modules for all the CSS.
* Fix a bug in the filterbar which was not filtering anything.
* Fix a l10n issue in songs view.
* Update hook to clean build repo before running, preventing to push
dev built code.
* Update webpack build code.
When not setting an endpoint protocol scheme at login, "http" was
assumed. Changing this to the same protocol as current one, to avoid
mixed blocked content.
Also prevent multiple submissions of LoginForm.
