Update URL of issue tracker

This updates the URL of the issue tracker for the "Log bug or feature
request" menu item within Help.
Merge pull request #150 from kylesorkness/fix_link_to_issue_tracker

Update URL of issue tracker
Observe txt file only setting. Fixes #154
Merge branch 'master' of github.com:mpcjanssen/simpletask-android
Added italian translation

I don't have Dropbox so i can't check the spacing of Dropbox message, if
you send me the compiled apk i check the correctness of the string at
least in the menu.

Regards

Carlo D.
Merge pull request #155 from onekk/master

Added italian translation
modified italian translation and checked on my smartphone

for readabililty at least in the settings screen.

Hope it is right.

Thanks for your kindness and patience

Regards.

Carlo D.
Revised italian translation, corrected some typos and modified

some description to better describe the program.

Regards

Carlo D.
Attribution of Italian translation in changelog
It's Carlo not Carlos.
Use string resources for side drawer headers.
Merged updated Italian translations.
Ensure clean gets called before a deploy

This ensures the git revision in the app is correctly updated.
Change deploy task to sync instead of copy
Updated Dropbox Sync API to 3.1.1

Possible fix for issue #163.
Merged master
Use material names