Fixed some grammar
Lint Issue Fix from #180
Improve file and comments icons.

Provide them in higher resolution and use the holo color scheme to match
the other drawables.
Improve file manager row layout.

Use non-deprecated size names, and properly center the icon.
Properly fix #174.

Re-use inflated header view instead of reinflating layout.
Don't prevent destroying fragments.

It might lead to multiple fragments being incorrectly attached; and we
prevent unneeded destroyings via getItemPosition() already.
Update to latest build tools.
Design Improvements #178

- Branch selection
- Margins and links
- Using attrs to set file explorer icons according to theme
- Make "View More" Button more visible and cleaner
Make sure to keep all fragments alive.

We only have a maximum of 4 pages anyway, so make sure they're not
needlessly destroyed once loaded, especially as they each do network
I/O.
Merge branch 'lint-issue-fix' of https://github.com/kageiit/gh4a
Merge branch 'for-upstream' of https://github.com/maniac103/gh4a
Merge branch 'for-upstream-ux' of https://github.com/maniac103/gh4a
Merge branch 'for-upstream-fixes' of https://github.com/maniac103/gh4a
Update README.markdown
Improve themed markdown/text/diff views
Fix method signature for the method called from the layout XML andoird:onClick attribute
Merge branch 'master' of https://github.com/suan/gh4a

Conflicts:
	res/values/strings.xml
Update README.markdown
Improved README formatting and grammar
Mark file status "renamed" as "changed"