Multi-Coin Support

[cvolny]

taviscaron,

The app failed to scan my multi-coin-pool's QR so I think these changes should add support for these. URL is in the form of:
https://mupool.com/index.php?page=api&action=public&coin=LTC

Adding the account fails in the app because without the coin attribute, the server responds with text saying to include that (not JSON). Ex: https://mupool.com/index.php?page=api&action=public.

Anyway, I'm not an Android programmer, but I am a Java programmer (when necessary) so that's why I said I think the changes should work. Let me know what I need to fix if this isn't right as I haven't tested this yet (installing the Android SDK now).

Cheers!

[asenchuk]

1. Yes
2. You need to implement just onUpgrade, because currently we don't have intents to make any downgrades (onDowngrade is needed in some new version where you're about to rollback the databalse version). The following behavior is expected: user have an some old app version which use DB v1 - database will be updated to v2 on first run and existent accoutns won't be removed; user performs clean install (w/o any existent version) and get clean v2 database.
3. Yes