Spawn openerp using same python executable

Solves issues of spawning wrong version of python or popping out of virtualenv
[IMP] runbot: nginx log_format: log request times
[FIX] runbot: correct build killing
[IMP] runbot: update github status at build birth and death
[FIX] runbot: give more life to builds
[FIX] runbot: differential kill and terminate
Fix server error when viewing runbot page with no repos

Only display filters when there are repos
Only display search when there are repos
Merge pull request #7 from bwrsandman/fix_empty_filter

Fix server error when viewing runbot page with no repos
Merge pull request #6 from bwrsandman/same_python

Spawn openerp using same python executable
Allow changing target_url from ir.config_parameter in github_status