Update changelog and bump version to v0.90 (909)

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
external: Update stoken to rev e5a13e5e8

This picks up the fix for the stoken_info memory leak.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
external: Switch from NDK r9d -> r10

This needs to invoke bash explicitly, as r10 has a newly-introduced
bashism.  See:

https://code.google.com/p/android/issues/detail?id=74145

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>