Fixed Spelling Error on Line 67

Fixes #12145

Mention |combine and the vault improvements in the CHANGELOG

Fixes #12099

FieldAttributes will now by default not be post_validated unless a flag
is set on them in the class, as a large number of fields are really there
simply to be inherited by Task/PlayContext and shouldn't be templated too
early.

The other (unrelated to the base issue) in #12084 is also fixed here, where
the roles field is loaded before vars/vars_files, meaning there are no vars
yet loaded in the play when the templating occurs.

Fixes #12084

Noticed while running Ansible from Tip.
Throws: NameError: global name 'tself' is not defined

More specific about urllib2 restrictions

Reflect new permissions for pushing to doc site

cloudstack: implement general api_region support, update docs

Fixes #12018

TODO: add this to VariableManager to validate vars loaded from files too

Fixes #12022

Update "smart" transport to handle Sun_SSH_1.5 on SmartOS

Link to `constants.py` in the source tree from the documenation.

Python 3: use print() as function under contrib/

`constants.py` is referenced in the *Environmental configuration* section of the documentation.  This change provides a link from the documentation to the source code.

This fixes the remaining Python 3 syntax errors, so re-enable compileall
for contrib/ again.

- Fixed line break causing part of the text to display as "Definition List"  which Sphinx renders in bold.

  which Sphinx renders in bold.

fixes #12111

Adding support for Archlinux and Slackware in fallback

Enable py34 test in travis so we don't regress recent fixes

Some steps towards Python 3 support

`assert (condition, message)` gets parsed by Python as `assert
a_two_tuple`, and a 2-element tuple is never False.

Discovered by compileall on Python 3.4, which emits a SyntaxWarning for
this common mistake.

(This is supposed to be temporary, until the code under contrib/ gets
cleaned up from all the remaining print statements.)