Updates to Readme

This commit updates the Readme to clean up the formatting and add
additional notes.
Add notice for display::env deprecation

This commit adds a notice to the display::env class to alert users that
it's being deprecated.

The management of environment variables should probably be managed by
other means.  A "profile", for example, is likely a better place for
this.
Add whitespace; Add note

This commit simply adds whitespace to a comment in a class.  It was
annoying me.

Also note that "params" is a private class.
Disable lint warnings about >80char lines

This commit disables the puppet-lint warnings about lines that are >80
characters.  While I agree that lines should be < 80 characters, we're
breaking that rule currently, temporarily.
Use shields.io for travis-ci status image

This commit switches to shields.io for the Travis CI build status
graphic for performance and customization reasons.
Bump to version 0.4.1
Merge pull request #8 from joshbeard/readme

0.4.1