changed gips directory because it doesn't work on windows. Installation path isn't available on write mode

Document explorer(navigator): Imported ubz files are always imported into "Untitled Documents" folder

Fix for a document's page duplication. Teacher bar's info wasn't quite correct. This is also related to ticket #409 part 2.

Fix for losing content mentioned in the ticket 228. The problem was actually in page deletion algorithm which has been flooding cache with invalid data, and that data was a object to return when loadDocumentScene was called.

Added fixes for audio and video path. On sankore 3.1 version 1.0.0 the absolute path has been introduced. Big mistake