Bump to 0.2.0
Changelog entries
Install UniMRCP 1.1.0 by default
Install Asterisk 11.6.0 by default

Asterisk publishes SHA1 checksums of releases, but Chef only supports SHA256 right now (https://tickets.opscode.com/browse/CHEF-3634)
Merge branch 'release/0.2.0' into develop