Support Manager (AMI) and ARI configuration

Additional parameters and config templates were added to support the
Manager (AMI) and Asterisk Rest Interface (ARI). concat was used to
allow for optional user credentials to be added to an installation.
Logic, examples, and template cleanups
Updated the README.md with new parameters
Test and security cleanups

Ran tests locally on Ubuntu 12.04 to construct the config files with the
new `manager` and `ari` options. Cleaned up defined types and examples.
Default for `manager_webenabled`

Updated README.md file and added default for
manager_webenabled ('no'). Newline at end of Modulefile.
Typo in validation for http_enabled
Merge pull request #3 from runswithd6s/config-updates

Config updates