Merge branch 'release/2.5.1' into develop
Actually bump podspec version.
Make sure the app doesn't crash, if the developer forgot to delete the old PLCrashReporter framework and the framework search path is still pointing to it

If the framework search path still has the path to an older PLCrashReporter framework set and that is set before the path to HockeySDK, then it would link against the old one causing the app to crash when trying to send a bug report, because the old PLCrashReporter version is missing some new properties.
Show a error message in the console, if an older PLCrashReporter version is actually linked and give a hint on what to do
Show [HockeySDK] prefix on all NSLog messages
Add some more info to log message to more easily classify them
If the server reports no versions available for update process, don't report this as an error
Add some error handler detection, to optionally notify the developer of multiple handlers that could cause crashes not to be reported to HockeyApp

Enable debugLogEnabled to get this warning.
Add missing new line at EOF
Link PLCrashReporter into HockeySDK binary framework distribution target

Based on the pull request https://github.com/bitstadium/HockeySDK-iOS/pull/2 from @ddeville

Also don't add the HockeySDKResource.bundle to the framework, only caused distributing it twice
Update documentation

New screenshots, some minor fixes and adjustments for installation documentations
Fix disableUpdateManager not working as advertised

This bug did not affect the automatic disabling of the module when run from the App Store! That one was and is working as advertised.
Fix setting UpdateManager.checkForUpdateOnLaunch to NO disabling usage tracking and expiry check not working
More fixes for UpdateManager.checkForUpdateOnLaunch and UpdateManager.checkForTracker

- checkForUpdateOnLaunch was not used when it should
- checkForTracker should still work, if UpdateManager is disabled! (This needs to be refactored in a future version)
- Also fixes sending two update check requests on startup instead of only 1
- Also make sure that the requests are really send if checkForTracker is enabled, no matter if updateManager is disabled or checkForUpdateOnLaunch is disabled, but don't show the update alert in those cases
- Don't send usage information when run from the app store and checkForTracker is enabled
Make private methods static to prevent name conflicts

https://github.com/bitstadium/HockeySDK-iOS/issues/3
Add another missing new line at EOF of a header
Remove NSString and UIImage categories, so the static library doesn't require the linker flag -all_load

The flag shouldn't be required, and worked in the demo project absolutely fine. But from now to then there was an Xcode bug that made it required again and some non reproducible scenarios where reported by users where it doesn't work without the flag. To fix this for always and forever, we don't use categories any more.
Fix wrong naming convention
Merge branch 'feature/NoCategories' into develop
Updated documentation