fixed PMDWarnings.

fixed md5 checksum error.
Merge pull request #950 from Catrobat/PMDWarningsPart9

fixed PMDWarnings.
issue#813 Added new testcase, fixed bug
Merge pull request #945 from Catrobat/issue#813

issue#813 Added new testcase, fixed bug
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