- add BMA280 ACC support
- add SIRIUS_MEGAv5_OSD board support

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1600 02679b44-d973-9852-f2fa-63770883b36c
- version update for 2.3 release

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1604 02679b44-d973-9852-f2fa-63770883b36c
Merge remote-tracking branch 'upstream/upstream_shared' into upstream_shared