add sources controller.
use serializer.
add get single content source.
add unit tests.
add binding tests.
1150297 - Update versions from 2.4.x to 2.5.0.

https://bugzilla.redhat.com/show_bug.cgi?id=1150297
add rest docs.
Fix failing nodes test.
Adds troubleshooting note on celery pickle warning
add test.
Merge pull request #1232 from bmbouter/add-pickle-celery-warning-troubleshooting-note

Adds troubleshooting note on celery pickle warning
Merge branch '2.5-testing' into 2.5-dev
Move the utility methods for creating symlinks & clearing directories from the PublishStep to the pulp/plugins/util/misc module
Adds tcp_socket shutdown to pulp-celery SELinux modle
Merge branch 'move-plugin-utils-out-of-publish-plugin' into 2.5-dev
Merge pull request #1233 from bmbouter/1149365

1149365 - Adds tcp_socket shutdown to pulp-celery SELinux module
Merge branch '2.5-testing' into 2.5-dev
Adds queue attribute to docs for Task Report
1102269 - Added documentation about deprecation of task_type
Merge pull request #1234 from bmbouter/adds-docs-worker-name-and-queue-can-be-None

Adds queue attribute to docs for Task Report