Define colorschemes and fonts on plugin only if they don't exists
Merge pull request #1 from tero/check-variable-existence

Define colorschemes and fonts on plugin only if they don't exists
Added support for multiword font names

The changes use the escape() function to escape spaces in multiword font names.
Merge pull request #3 from AmaruCoder/master

Added support for multiword font names.
gvim compatibility
Merge pull request #5 from mmai/master

Gvim compatibility
merged upstream