decrease default window height from 630 to 618px on OS X

fixes warning:

    content rectangle not entirely on screen with the menu bar (May not be
    completely visible for all screen resolutions and configurations)
Merge branch 'master' of https://github.com/getlantern/lantern

* 'master' of https://github.com/getlantern/lantern:
  Added better error handling
  Fix for JRE install on OSX from installer wrapper closes #901
  Fixed windows jre download and installer name
set MACOSX_DEPLOYMENT_TARGET = 10.6.8

resulted from refactor > convert to modern objective-c syntax
update to latest build of os x lantern browser
update to latest lantern-ui