Updated cloudwatch output documentation comments
Merge branch 'master' into cloudwatch-docs
Added support for all Nagios statuses in output

Previously the nagios output only supported issuing:

* WARNING, or
* CRITICAL

for check results.

This commit adds support a config option, nagios_level, which
defaults to CRITICAL and can be overriden by the "nagios_level"
field in an event.
Updated with feedback from Jordan
Merge branch 'master' into cloudwatch-docs
Updated cloudwatch output documentation comments
Added list of cloudwatch region's
Merge pull request #298 from jamtur01/nagioslevel

Added support for all Nagios statuses in output
Merge pull request #299 from semiosis/cloudwatch-docs

Cloudwatch docs
- 'eval' wasn't working well on 'config :foo ...' lines that used
  in-scope constants/variables.

  Switched to using monkeypatching the 'config' method instead.

  There's still slight bugs, like the 'charset'  on all inputs has no
  validation nor default listed.
- call them attributes
- call 'setting_name' simply 'name'