Disable file open-from-other-app

Removed ability to open images (and other file types) from other apps. Will need to revisit code for doing this propery and re-add the plist entries removed by this commit at that time.
Merge pull request #45 from montehurd/disableOpenFromOtherApp

Disable file open-from-other-app
Partial implementation of external browser setting

Still needs clean-up and method for actually opening links based on choice.
More progress on selectable browser

Cleaned it up visually and made it degrade gracefully if the browser was deleted.
Localisation updates from http://translatewiki.net.
Add en-ca, ml messages files
Adjusted settings page layout a bit
Info and about buttons stand out against light bg

The info and about buttons float over the images on the My Uploads page. When floating over light images the buttons would blend in too much and be difficult to see. Added a slight dark shadow around the buttons to provide some visual contrast.
Moved to Apache
Merge pull request #48 from wikimedia/license-fix

Moved to Apache
Refactored the browser helper object

Easier to manage weird url schemes now without the need for additional code logic.
Re-added entries which disappeared from storyboard
Removed the web view controller from storyboard

It was unused
Made the browser selector use a table view

Also made it slide the "Open Links With:" label beside the selection when the selection is made. Also shifts the selection to the top when the settings page appears.
Added opt-out for metrics tracking to settings

Will need to check statistics to make sure tracking opt-in and opt-out are being recorded. I believe they should be.
bump version to 1.0.2
Refactored BrowserHelper's getInstalledSupportedBrowserNames
Refactored opt-out to use log:event:override:

Also changed "Metrics tracking" to "Usage Reports" and added "Send usage reports to Wikimedia to help us improve the app".
Abstracted logging and browser prefs to CommonsApp

Keeps NSUserDefaults stuff less dispersed.
Removed redundant "Safari" fallback checks

No longer needed because in "application:didFinishLaunchingWithOptions:" the call to "[[NSUserDefaults standardUserDefaults] registerDefaults:" ensures the value will be "Safari" by default.