Support other API levels than 21.

[njroussel]

http://developer.android.com/about/dashboards/index.html#Platform

At the moment the app doesn't work on api levels higher than 21.
It would be nice to hit these too.

More importantly, supporting 4.4 would allow us to hit 50% of the market.
The current compatibility with 4.4 is unknown. (Will update this comment later, ping me if I don't do so)

[JBouron]

Is it really worth it for the moment ?

[njroussel]

No this is just an issue, we can do it whenever....
I sincerely think that it shouldn't be too hard.

[njroussel]

API Level	Compatibility
Earlier than 21 (not included)	UNKNOWN
21	Supported
22	Supported
23	Not supported

[zifeo]

What is missing for the 23?

[njroussel]

Runtime permissions handling seems to be the main problem.
I don't know about anything else, as I can't pass the login screen without the correct permissions.