Memoize octicons typeface
Store view and extra variables from onCreate
Update French translation

Closes #258
Use super class helper for getting serializable extra
Set view and intent fields from onCreate
Add support for browsing commits on any tag or branch

A ref selector is shown at the bottom of the commits list
in the same style as the code tab.

Closes #235
Remove extra newline and unneeded curlies
Add ability to preview comments as markdown
Externalize failure strings
Remove unneeded null initialization
Log cause exception when authorization fails
Add missing Override annotation
Log exception when loading rendered markdown fails
Remove unneeded language mode index.html files
Allocate new String for name and content

This is required on Android 2.2 to the values passed
to CodeMirror are of the JavaScript String type.

Closes #256
Cast null to remove ambiguous call

Closes #261
Add German translation of comment preview and markdown error

Closes #260
Update italian translation

Closes #259
Update french translation

Closes #262
Update Ukrainian translations

New strings added and some long words replaced with shorter.

Closes #264