new cli, bug fixes and cli option normalization

Changes:

• csvcols has an option change, -f is now -col

Additions:

• csvfind will help you find things in a CSV file by searching a single colum
  • search options include exact match, contains and Levenshtein edit distance
• csvjoin will let you join two CSV files on a column
  • includes support for approximate matching via Lenenshtein edit distance on join column

Documentation has been re-organized. Beginning to add a "How To" section for website. Lots of small BUG fixes.

datatools Go package is beginning to combine common functionality used between the CLI. dotpath continues to be debugged.