module(apt_key): don't catch `SystemExit`

If we do this, we risk outputting two JSON payloads, which will be
unparsable.
module(nagios): don't catch `SystemExit`

If we do this, we risk outputting two JSON payloads, which will be
unparsable.
Adds postgres support for Ansible RDS module
Merge pull request #5303 from mohangk/rds_postgres

Adds postgres support for Ansible RDS module
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
Merge pull request #5312 from willthames/ec2_tag_enforce_state

 Make state=present the default for ec2_tag
Merge pull request #5162 from JensRantil/fix-corrupt-module-outputs

More don't catch `SystemExit`
fix typo in synchronize module
Merge pull request #5336 from psftw/devel

fix typo in synchronize module
Add the ansible-galaxy command
Add 1.4.2 notes to changelog
Fix current version in docsite index.rst
Add example4 to the docsite AWS guide
Fixes #5341 Use constants.py to set the roles directory
Addresses #5341 expand home directories for role_path in ansible.cfg
Addresses #5341 Expand home directories when searching for roles in ansible-playbook
Update install documentation to include httplib2

With v1.4.2 setup.py requires httplib2 for install
Fix debian builds by adding a missing ','
doc: fixed changelog format
Merge pull request #5350 from jlaska/fix_debian_builds

Fix debian builds by adding a missing ','