Changes rspec format to documentation style
Modifies the db migrations

*Adds association between votes and surveys
*Adds lat/long fields to the surveys table, so vote lat/longs can be compared for eligibility.
Adds rspec tests for user model

Tests validations for user attributes' presence
TODO: test for duplicates
Adds rspec test for invalidating duplicate email addresses
Adds attr_accessible and validations to User model
Adds rspec tests for Response model

Checks validations, accessiblity, and duplictions within the scope of a single survey
Creates Response model wiht validations and attr_accessible