Done with the bookmark functionality, code uploaded for review
This unknown error got solved python: /builddir/build/BUILD/Python-2.7/Modules/gcmodule.c:311: update_refs: Assertion gc->gc.gc_refs != 0' failed.` , when i changed the name of the param bookmark to bookmark_time, when passing it in render_template function.
Review link http://codereview.appspot.com/4592048/ , i will push it to the repo after review.