Update Hebrew translation
Update Japanese translations
Check for existing token during two-factor login

OAuth2 token notes must be unique so without this check a
login from a 2nd device will fail when it tries to create an
authorization and one already exists.
Prepare 1.9 release
Added support to edit / delete issue comments.
Added support to edit / delete gist comments.
Fix "star" in tr translation
Scale down avatar images to save memory.

This gets the maximal display size of avatars from the style specification
and downsamples the loaded avatar images to be close to that size, with no
(to me) visible degradation of quality. Bonus: you actually see the rounded
corners of the images now.

Before this patch, each loaded avatar image occupied 850k of RAM, causing
the app to OOM after longer usage. With this patch, one image occupies
50k of RAM, preventing OOMs (device: Moto X).

Fixes #513
Might be a fix for #509
Add license to the top level directory.
Update README.md
Update README.md
Merge pull request #555 from rodrigoargumedo/master

README.md correction
Update README.md
Merge pull request #556 from MaximLoguncov/master

Update README.md
Tightened regex on UserUrlMatcher. Closes #554.
Fix #561
C++ highlighting for .cxx and HTML for .htm
Correct highlighting for C/C++ file extensions
Finished an icelandic translation of the app
Merge pull request #532 from kiziltug/patch-1

Fix "star" in tr translation