tbb-install.py: Mac now uses .dmg file
tbb-install.py: cache bundle downloads
tbb-install.py: Added TBBInstaller.path()
tbb-install.py: Fixed typo 'rmtreee' -> 'rmtree'
tbb-install.py: Handle unrecognized bundle extension better
tbb-install.py: Cache GPG signature file
tbb-install.py: Updated application name for Mac
tbb-install.py: handle RuntimeError from install
tbb-install.py: handle DMG bundles
tbb-install.py: Fixed moving existing application aside
tbb-install.py: Copy application to install instead of moving
Allows installation from read-only mounted DMG