Merge pull request #328 from skarnik-rmn/master

importing logging.handler because only importing logging breaks sending email when there is a faliure
validate_parent_access when trying to push a new layer
Fix issue #333 - Added CORS support to 'get images' and 'search' methods in registry REST api
adding an AUTHORS file

This is the product of "git log --format='%aN <%aE>' | sort -f | uniq > AUTHORS"
plus some cleanup to remove duplicates and noise.
removed auth session (tokens stay valid until expired)
standalone is always true except when it's false
pep8 fix
Add new compat and exceptions files
Enhance config error reporting and fixes #44
Make flake happy
Merge pull request #335 from mhrivnak/authors

adding an AUTHORS file
Merge pull request #340 from dotcloud/config

Config
Merge pull request #338 from abonas/addCORS

Fix issue #333 - Added CORS support to 'get images' and 'search' methods in registry REST api
clear session whenever auth is invalid
Merge pull request #336 from shin-/private-layers

Private layers
Small fix to validate_parent_access
Added missing dependencies to README relevant for Fedora
Merge pull request #342 from abonas/fixREADME

Updated Fedora instructions and other README tweaks
Disabled postinstall which inits the bandwidth parser

Docker-DCO-1.1-Signed-off-by: Sam Alba <sam.alba@gmail.com> (github: samalba)
Only check parent access if there is a parent