add ignore file
Add select box with actual HPI curriculum

In order to make it easier for users to compose their curriculum,
I added a list of actual HPI courses from WS10/11 until WS12/13
that users can pick from instead of entering their courses manually.
These courses were parsed from the HPI homepage using the Ruby
program located in courses/.
While there might still be some flaws in the data, it should be
pretty useful right away.
Merge pull request #4 from mkilling/course-list

Course list