Cleaning up the urls to work with django 1.5
Making the care creation form only allow one car slug value per user.
Cleaning up some of the issues found by pylint.
Changing the URLs to start with car instead of a slug value.
Making model changes to allow Europeans to use this application (changing gallons to fuel_amount,
and price per gallon to price_per_unit).
Cleaning up the model names:
	Removing Scheduled Maintenance
	Making Scheduled Maintenance an abstract class
	Cleaning up the forms in order to match the changes to the models file.
Fixing deprecation issue.

Using the correct import path when updating to django 1.5

fixes #14
Cleans up the trip_detail html code (removing blank lines).
Cleaning up Query Sets for Maintenance Record manipulation (requires that the current user owns the car, and that the car actually owns the record that is being manipulated.
Redirecting back to the cars detail page after record manipulation.

fixes #13
fixes #15
Adding sorting to the models.

fixes #16
Adding ability to show the latest gasoline and oil changes on the car details purchase.
Fixing issue of showing the delete page for oil changes.

fixes #17
fixes #9
fixes #8
Merge pull request #18 from rerobins/rerobins_dev

Merging in development fixes into master.