Prevent user from posting multiple times

Disabling the navigation bar buttons when there is a post (new idea/comment) in progress so the user won't post the same content multiple times.
Besides posting multiple times, this was causing a crash on the app when the additional requests responses returned.
Importing Yahoo! provided translations
Merge remote-tracking branch 'rafaelbaggio/master' into yahoo
Add localized strings in Portuguese
Fix a few things for iOS 7
Merge pull request #153 from hebertialmeida/master

Add localized strings in Portuguese
Update changelog
Remove processModel nonsense
Try to fix issue with updateVotesRemaining
Fix typo
removed usage of undefined NSFoundationVersionNumber_iOS_6_1 in < iOS SDK 6
Merge pull request #154 from aporat/master

remove usage of undefined NSFoundationVersionNumber_iOS_6_1
Check for iOS 7 in a way that works in Xcode 4
This is what I meant
Handle iOS 6 issue with multiple form sheets in a more robust way
Merge remote-tracking branch 'origin/master' into yahoo

Conflicts:
	Resources/pt.lproj/UserVoice.strings
Make uitableviewcell fields (custom fields, email, name, category, title, etc) look better on iOS7
Don't need to redefine that
Fix status bar on idea view / ios7
Remove horrifying cell backgrounds on ios7