all: 0.2-beta update

Yes, this is the official beta release. No more huge major features will be added until after 0.2 has been released. Which is going to happen soon. The beta will be over once:

Tests have been done on a few Linux distributions to see if it compiles fine.

Created a few demos to show off/advertise.

The changelog for this commit: exposed more options, cleaned up physics-bh, added support for input file transformations.