Pulled in 2.0 code.

Fetched gem from:
https://rubygems.org/gems/trollop/versions/2.0
...since there seems to be no orrifical repository for this anymore.
Merge branch '2.0-integration'

* 2.0-integration:
  Pulled in 2.0 code.
Merge branch 'patch-1'

* patch-1:
  Markdown-ified
  Rename README.txt to README.md

Conflicts:
	README.md
Updated links in README.
Merge pull request #3 from karlwilbur/master

Updated to 2.0 and updated README.