[#5561] Added button to maximize commit view

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#5561] Added maximize button to file and file diff view

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#5561] Refactored maximize content button to macro

Also fixed issue with maximizing diff browser

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#5561] Fixed commit browser not working in Allura theme

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>