Edited gem file sqlite3 and pg dependencies to prepare for Heroku deployment.
Removed db/migrate/20130225221643_add_year_to_car_model.rb because it was redundant, added a column to a table that already exists. This caused problems migrating to Postgres on Heroku.
Removed db/migrate/20130225221822_drop_car_year_table.rb because it was trying to drop a table that didn't exist. This caused problems migrating to Postgres on Heroku.
Added 'paint_name' attribute to db/migrate/20130225214824_create_car_colors.rb. Corrected typo (capital L instead of lowercase l) in db/migrate/20130226064320_create_wheel_offset_options.rb.
Added default value of 0 to image_like_counts in Images table, corrected bug that user_id type in Images table was string instead of integer. These were causing problems in Postgres on Heroku deployment, but not in SQLite in the local deployment.