Basic File Parser

Add basic file parser for the default format (a more or less csv file)
- Rename BaseParser to Parser
- Update CSVFileParser to reflect name change of base Parser class
- Add email to Gemspec
- Add install task to Rakefile instead of having build install the gem
- Store start and end dates as parsed Date objects instead of strings
- Update README
- CSV parser is starting to work like it should
- Add example files
- Update GasTank class to do less parsing and more information holding (yay!)
- Change default task in Rakefile to rebuild (makes it faster for me)
- Create watchr script (even faster development!)
Changed names in example files
Merge pull request #1 from awkerney/csv_parser

Csv parser