Refactor ProjectUpAndDownloadTest

* update okhttp lib to 1.2.1
* reintegrate testRenameProjectNameAndDescriptionWhenUploading
* reintegrate testDownload
* reintegrate testUploadModifiedStandardProject
* remove unnecessary intents
* refactor private methods
Merge pull request #760 from Catrobat/FixProjectUpAndDownloadTest

Refactor ProjectUpAndDownloadTest