Added letter spacing to 'edit' and 'remove' buttons and increased font-size for readability
Added additional columns per client request

* Added food_instructions column to pets table in db
* Added visit_instructions column to pets table in db
* Added keys_on_file column to accounts table in db
* Changed birth_month data type in pets table from 'date' to 'integer'
* Set keys_on_file default to 0 in accounts table
* Updated accounts_controller strong params to accept keys_on_file
* Updated pets_controller strong params to accept food_instructions
  and visit_instructions
Fixed logic in session_controller to direct user to dashboard if they have an existing account or to new owners action otherwise
Added form fields in new pet view  for populating food_instructions and visit_instructions