Dan GRUG prep

Some cleanup commits followed by a commit that adds and bootstraps cucumber.

- SQLite3 added
- Gemfile updated to include cucumber and related gems
- Routes includes wrapper for devise issue
- .gitignore patched with RVM ignore
- Cucumber set up:
   * YAML set up
   * TXT file of helpful links
   * Initial feature with one scenario: browse poems
   * Initial step definitions
   * Initial supporting methods

This is now ready for the GRUG meeting!