(env)prayashm@zappy:~/workbench/tryton-repo/sao$ pip install hgreview
Downloading/unpacking hgreview
  Downloading hgreview-0.4.tar.gz
  Running setup.py (path:/home/prayashm/workbench/tryton-repo/env/build/hgreview/setup.py) egg_info for package hgreview

Requirement already satisfied (use --upgrade to upgrade): Mercurial>=2.1.0 in /home/prayashm/workbench/tryton-repo/env/lib/python2.7/site-packages (from hgreview)
Downloading/unpacking review (from hgreview)
  Could not find a version that satisfies the requirement review (from hgreview) (from versions: 1206, 1510, 695, 709, 801, 966, r515, r530, r537, r554, r579, r588, r640, r749)
Cleaning up...
No distributions matching the version for review (from hgreview)
Storing debug log for failure in /home/prayashm/.pip/pip.log