fixes #247
fixes connection lost in other view controllers
refactored initialisers to use gcd
Merge branch 'master' of github.com:Catrobat/Catty into hotfix/issue#251

Conflicts:
	src/Catty/ScenePresenterViewController.m
fixed memory leak when restarting a scene, refactoring
changes starting scene
minor changes
added base web view controller,  refactoring
WebViewController navigation, subviews
changes webviewcontroller, loading view controller from root view controller
changes web view scrolling behaviour
fixes hide toolbars/nav. bar while scrolling down
tap gesture for show/hide controls
Merge pull request #264 from Catrobat/issue-#247

Issue #247
fixes #252
changes handle navigation + sub views
bug fixes help web view controller
Merge branch 'master' of github.com:Catrobat/Catty into feature/issue#252

Conflicts:
	src/Catty/CatrobatTableViewController.m
fixes scrolling buttons behaviour
Merge pull request #274 from Catrobat/feature/issue#252

HelpViewController issue #252