use capybara-email gem to test password reset feature
add invite a friend feature
create tokenable module for generate token and refactor related tests
minor readme updates
method renaming, bug fixes, refactoring from code review
minor fix to rating=() test for review not present
move tokenable concern to app/models/ directory per dhh
change smtp settings to heroku mailgun addon
migrate description columns from string to text for postgres 255 char limit on strings
rewrite database seed file for relationship parent error
Merge pull request #8 from leeduan/mod7

Mod7 merged.