frontend: added rule icon for SPI rule
simulation: made home-advantages of below 1 actually reduce the weight of the rule
backend: added ability to clear cache via admin interface
frontend: added/improved some information on different sites
frontend: improved shortcut icon / favicon
frontend: navbar: made gap between grass and text a bit larger
frontend: navbar: continue grass on active navbar items
Merge pull request #1 from databus23/master

Initial stab and automated deployment via chef
frontend: added javascript library dependencies to version control (they are subject to their respective LICENSE)

This is done to make deployment easier.
added dependencies of the simulator as a submodule

This makes deployment a lot easier.
switch to https for submodule url to allow read-access without authentication