Merge pull request #3 from rvesse/master

Add ICO files
Restyle triplestore icons (moving elements, resizing...) and fix README.md generation
Restyled further svgs
Regenerate all semicons, niceup Makefile and add ico-generation to "make prepare"
add new icons ("interlink local and outside world" and "find groups")
add new icons (for Data Cube vocabulary)

- attribute
- data set
- dimension element
- measure
- slice