Refactor Bluetooth connection
Refactor the bluetooth socket connection.
The code to establish a socket is not trivial. It should be easy to
reuse it for future projects (Albert, Arduino..)
pmd warnings fixed.
pmd warnings fixed and time performance for robotium added.
pmd warnings fixed.
Merge pull request #939 from Catrobat/bt_refactoring_step_1

Refactor Bluetooth connection
Merge pull request #955 from Catrobat/PMDWarningsPart5

pmd warnings fixed
Merge pull request #956 from Catrobat/PMDWarningsPart11

Pmd warnings fixed
Improved SourceTests, again
Merge pull request #948 from Catrobat/sourceTestIssues

Improved SourceTests, again
Remove last PMD warning
use char Array instead of StringBuilder
Merge pull request #957 from Catrobat/noMorePMD

Resolve last PMD warning
problem with file chooser intent fixed.