Merge pull request #13 from hjhartung/dev

removed customers and item_splits, added tax_percentage to items
tables are bootstrappified, small changes to navigation bar
fixed merge conflict
Merge pull request #14 from deliaz1993/master

tables are bootstrappified, small changes to navigation bar
added description to items, password confirmaiton to user, and included bcrypt in gemfile for user authentication
integrating users into models, added bcrypt to gemfile
changed renamed Session Table to Order