Issue-771. RtReleaseITCase.java fixed.
* now new initialized repo will be used instead of predefined(possibly not initialized) repo;
* unnecessary fields, "before" and "after" methods removed.
Issue-771. RtReleasesITCase.java auto initialization of repo added.
Issue-771. RtReleaseAssetITCase.java auto initialization of repo added.
Issue-771. RtReleaseAssetsITCase.java auto initialization of repo added.
Issue-771. RtTagITCase.java auto initialization of repo added.
Issue-771. RtTagsITCase.java auto initialization of repo added.
Issue-771. RtReferencesITCase.java auto initialization of repo added.
Issue-771. RtBlobsITCase.java auto initialization of repo added.
Issue-771. random numeric names of repos replaced with random alphanumeric names.
Issue-771. try-catch replaced with @BeforeClass and @AfterClass
Merge pull request #776 from aistomin/Issue-771

#776: pull request Issue 771 Repo initialization added for integration tests