update copyright dates
Add nodejs-less dependency for RHEL. Fixes #486.

Also enable "compression" of stylesheets.

Compression is used to compile the LESS stylesheets into CSS at
startup. With compression disabled, the default horizon theme does
not work because the stylesheets are served as raw LESS files.
Merge pull request #114 from rackerjoe/copyright

Merged automatically by jenkins after successful build test
Merge pull request #115 from DavidWittman/486-rhel-css

Merged automatically by jenkins after successful build test
Allow a custom cert/key location to be specified
Merge pull request #118 from andymcc/custom_cert

Merged automatically by jenkins after successful build test
Add contribution guidance

Add CONTRIBUTING.md that points to the same document in chef-cookbooks
Add mention of the contribution document in the top of the README.md
Merge pull request #119 from claco/contributing

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Offline compression enable by default on RHEL packages. Changing to be consistent with Ubuntu.
Merge pull request #120 from git-harry/master

Merged automatically by jenkins after successful build test