Changed the Dive model

- changed pressure_group into starting_pressure_group and
ending_pressure_group
- added dive time as an integer (intended to be in minutes)
Removed background color on a:hover

It was just annoying.
Merge pull request #3 from erahm/dive-model

Dive model
Merge pull request #4 from erahm/ui-design

Added some simple styling
Updated project specs
Adding devise gem.
Generating User model
Adding user login to the index.
Make 'My Dives' only appear when user is logged in
Added several models and created associations
Merge branch 'models'
Added foreign keys to model associations

created new migrate files to add foreign keys.
Only display dives that actually belong to the current user
Merge pull request #7 from erahm/models

Only display dives that actually belong to the current user
restructured repo so that project is at the git root
Removing deleted files from repo
merging master changes for directory restructure
trying to get application.css working correctly
Removing my env stuff because I MESSED UP DAWG
Updating gitignore so that it wont pick up the old divelog dir