set ident-width of BitAttributedLabel to 4 spaces

seems this is the used one, so set it in the xcodeproject
fix mem leak
fix warning 'multiple methods length found'

* method accepts either NSStrings and NSAttributedString: assert on that
* explicitly cast to NSAttributedString to get rid of ambiguity warning
fix mem-leak analyzer warning

Although the analyzer is wrong here (highlighFramesetter property is synthesized), it doesn't hurt
to use the instance variables.
fix analyzer warning

it's somewhat more clear to release and set to nil,
then store a new reference directly in the ivar.
Merge pull request #43 from diederich/fix/analyzerWarnings

Fix analyzer warnings
Fix git link to the Github repository in the advanced documentation
Merge branch 'develop' of github.com:bitstadium/HockeySDK-iOS into develop
don't let messages pile up
fix typo
provide a result in feedbackComposeViewController's delegate

fixes #31
Merge pull request #34 from bitstadium/nitpicks

don't let messages pile up
Integrate first test version of PLCrashReporter v1.2 with BIT namespace

Fixes #37
Fail if the developer tries to setup the SDK on a background thread

Fixes #39
First version of new AppStore Update module
Add new localization string for store update module

All english for now, except german
Documentation improvements for the new store update manager
Don't use hardcoded bundle identifier

(That was intended for testing only)
Unit tests and refactoring
Manual checks always being ignored