Created a new get method for Renditions(getNodeRenditionUntilTheyAreCreated), that waits for the renditions to be created.
Modified 3 tests from the CreateRenditionsTests.java class (adminCanCreateRenditionToExistingNode(), userThatCreatedFileCanCreatePdfRenditionForIt(),userThatCreatedFileCanCreateDoclibRenditionForIt()) in order to pass on slower machines.