Remove IDE related stuff

Tiny PR only to remove IDE related stuff.

BTW, I think this should be done at a global/user level with a ```.gitignore```, something like:

```sh
$ git config --global core.excludesfile '~/.gitignore'

$ cat ~/.gitignore
# Vim
.*.sw[a-z]
*.un~
Session.vim
.netrwhist

# IntelliJ
*.iml
*.ipr
*.iws
.idea/

#Mac OSX
.DS_Store
.AppleDouble
.LSOverride
Icon
._*
.Spotlight-V100
.Trashes 

#ST2
*.sublime-workspace
```

Only to avoid future mistakes ;)