Fixed compilation error if the Deployment Target is pripr to iOS8
The extension will now work if the Deployment Target is prior to iOS8
Added one more check
Merge remote-tracking branch 'origin/master' into bugfix/fix-compilation-errors-if-deployment-target-less-than-ios8

Conflicts:
	OnePasswordExtension.m
Making sure OnePasswordExtension comments are shown in Xcode documentation.
Code cleanup and refactoring. Fixed problem where completion block was not called in some cases when filling the web page.
Cleaning up xcassets.
Merge pull request #19 from AgileBits/bugfix/fix-compilation-errors-if-deployment-target-less-than-ios8

Fixed compilation error if the Deployment Target is prior to iOS8