adapt Makefile to handle interactive bower question
fix indents in Makefile
initi all submodules befor updating branches
add comment to wheel cache initialisation
fix issues with psycopg installtion
use git from nix env-2 and setup ssl

- install certificates in nix environment
- setup git ca-path
Merge pull request #2 from policycompass/fix-makefile

Fix multiple issues buildenv setup