Remove non-project ignores from .gitignore list

The project .gitignore file should only contain things that are directly
connected to the content of the repository. Ignores specific to the
environment such ones created by operating systems or editors should be
ignored at a global level. Otherwise we'll just end up ignoring
everything in the local configuration.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>
Merge branch 'master' of github.com:marcusk/antisleep