fix typo in synchronize module

More don't catch `SystemExit`

 Make state=present the default for ec2_tag

Using `ec2_tag` module without the state argument
currently results in:
```
failed: [127.0.0.1] => {"failed": true, "parsed": false}
```
This fix makes `state=present` the default

Adds postgres support for Ansible RDS module

rax: import novaclient.exceptions for cs.images.find

tests depend on the default encoding being utf8

Improve IRC module. Fixes #5186

improve error on invalid vars file (if its a list instead of a dict)

Fix permission error when using easy_install through sudo

ssh_alt - only trigger 'fatal' when returncode == 255 (interpreted as 'c...

`env-setup` fix for zsh <= 4.3.10

Prevents UnicodeEncodeError

This reverts commit 15b89b45, reversing
changes made to 3d836a1a.

Fixes #5159 `file` module: Don't catch `SystemExit`

postgres_db CHECKMODE changed status

Fix setup.py to work with 'pip install -e .'

ssh_alt.py / decrease # of ssh roundtrips

Minor docsite fixes

cs.images.find(human_id= throws novaclient.exceptions.NotFound,
resulting in the try/except block with
image = cs.images.find(name=image)  being skipped. catching
novaclient.exception.NotFound allows images to be specified with the
human readable name.

Example:
  tasks:
    - name: Server build request
      local_action:
        module: rax
        region: DFW
        image: Ubuntu 12.04 LTS (Precise Pangolin)

Also, the import is placed after try: import pyrax, because pyrax
imports novaclient and should fail if novaclient is missing.

fix when the system does not have lsb_release script, but has /etc/lsb_release file

Fix for issue #4730 - stacktrace when deferenencing a non-existent group