project file + gitignore

Hi,

I made some changes to the project file and added a .gitignore file.

1b25979: files created during compilation are now created in the directory "tmp" (except binary)

70d4122: added a .gitignore file. (These files/folders won't show up on executing "git status")

5f28067: The desktop-test compiles under linux now. (I guess it should also be possible to do this for mac)

I only tested this under linux.

Greetings
Benni