Merge pull request #276 from hwhw/master

do not handle Android app events/commands in timing critical section
fix cannot login to Evernote
revert additional visualAlignmentWidth to keep left/right margin the same
install openssl libraries on Android incase some ROMs don't have
Merge pull request #277 from koreader/chrox-master

install openssl libraries on Android
replace viewport check by clamping

The viewport dimension check was buggy (wrong upper limits).
We don't need it there anyway, rather, we clamp the coordinates
in the viewport() implementation in the Blitbuffer API.