Refactor buildPath() calls in StorageHandler

This is a small leftover from the gsoc_backpack branch merge.
* Added static imports where I thought they were useful. The only thing
  I couldn't really decide was whether to make a static import for
  BUFFER_8K, so I left it as is. For the rest of the file, the context
  is clear and makes the code more readable.
* Changed the preferences of when to use star imports. I was the one who
  changed it from 99 to 5. I see now how that was a mistake and it is
  hereby corrected.
Remove redudandent code in ScriptActivity

Leftover from gsoc_backpack, this is covered by BaseActivity.
Move BackPackActivity to the other activities
A Fragment is a Fragment is a Fragment
Merge pull request #713 from Catrobat/gsoc_backpack_leftovers

GSoC backpack leftovers
Fixes #686

new method comparePixelArrayWithPixelScreenArrayWithTolerance;
adapted tests accordingly
Merge pull request #714 from Catrobat/issue#686

Fixes #686
fix unstable test

remove System.gc() call - caused several unstable testruns
Merge pull request #717 from Catrobat/fixUnstableTest

fix unstable test
Refactor many testcases to run on the Emulator rather than on the Device
Revert UploadDialogTest.testUploadingProjectDescriptionDefaultValue
Merge pull request #719 from Catrobat/RefactorUITests

Refactor ui tests
Added asserts to clarify failure of unstable test:
testProjectDetailsLastAccess
trying to fix testProjectDetailsLastAccess

sometimes standard project is not created!
this test needs 3 projects with different timestamps,
so standardproject is created if necessary!
Merge pull request #718 from Catrobat/fixTestProjectDetailsLastAccess

Fix testProjectDetailsLastAccess
change dialog style and layout for all custom dialogs
add a titel to many dialogs
add possibility to check code with checkstyle

- checkstyle config file is located in catroid/ project
- projects use this config file (project relative - local)
- project checkstyle config (location of checkstyle config,
excludes,...) located in .checkstyle project file
- projects can be checked with rightclick-checkstyle-check Code...
add ScrollView to NewVariableDialog
Merge pull request #707 from Catrobat/issue#657-b

Apply the same style to all Dialogs.
Fixes #657
Fixes #414
Fixes #677
robotium update to 4.3.1-SNAPSHOT and fix tests