Documentation cleanup

  - Added initial pass at README
  - Moved some hardcoded strings/message output to constants
  - Added further clarification on final designation on Parser/Validator methods.
Merge branch 'master' into fix-documentation-improvements

* master:
  Updated lib to remove array short syntax ([]) to allow lib to support PHP 5.3.
Update README.md

  - Cleaned up output of README file.
Merge pull request #4 from ReservedDeveloper/fix-documentation-improvements

Fix documentation improvements