Fixed and implemented CSV cmdlets
Added tests for the CSV cmdlets
Support for escaped characters in strings.

Escaped characters are now properly replaced by the actual ones.
Csv cmdlet fixes; Resolve escape character fixes

Resolving escaped characters didn't always work with the regexs that were used. This issue was
fixed and a proper test was added.

Fixed last issues with CSV commands
Merge pull request #226 from sburnicki/csv_support

CSV cmdlets support; Escape character support