* Now can change the list of themes that will be installed:
Install only Papirus and Papirus-Dark:
`make THEMES="Papirus Papirus-Dark" install`
Install all except ePapirus and Papirus-Light
`make IGNORE="ePapirus Papirus-Light" install`
* Deleted `make post-install`. Icon caches now building with
`make install` if DESTDIR is not set
* Added `make dist`
* Added .gitattributes. It excludes tools from releases
