postgresql_user: fix docstrings

Change documentation of "state" param to refer to user (role) state instead of
database state.

Change 2 function docstrings to reflect the code
Merge pull request #2543 from b6d/postgresql_user-docfix

postgresql_user: fix docstrings
Typo in documentation.
Merge pull request #2547 from jsmartin/cloudformation

Typo in cloudformation module documentation.
Update release version.
Preliminary ability to use Jinja2 {{ }} to replace ${foo.bar} in playbooks.  Can't use both at the same time per line.
Update README.md
Update README.md
Update README.md
Improved backrefs example in lineinfile.
Fix typo in message.
Merge pull request #2563 from gw0/fix-lineinfile

Improved backrefs example in lineinfile.
Merge branch 'devel' into npm
Updating version added and class instantiation