Merge branch 'release/0.9.21' into develop
Merge branch 'hotfix/0.9.21.1' into develop
adopt changes in rime api 1.0.
update submodules; fix Apple clang & libc++ issues.
register and activate input source.
fix warnings.
activate input source as current user, to fix googlecode Issue 419.

otherwise, the input source will be inactive after logging out.
apply xcode recommendations on project settings.
update taskbar icon (rime.pdf).
drop support for OS X 10.6.
librime.0.dylib.
fix squirrel icon in growl notifications.
Squirrel 0.9.22 release.
Merge branch 'release/0.9.22'