Update README to conform with template

Add template sections and organization to original README. Add information about providers, features, and parameters. General edits for clarity and completeness.
Remove extra READMEs

Delete the per-VCS readmes. They are all combined in the main readme now.
Merge remote-tracking branch 'laurenrother/readme' into 1.0.x
Release 1.0.1

Summary:
This release is the first supported release of vcsrepo. The readme has
been greatly improved.

Features:
- Updated and expanded readme to follow readme template

Fixes:
- Remove SLES from compatability metadata
- Unpin rspec development dependencies
- Update acceptance level testing
Merge branch 'release_1.0.1' into 1.0.x