Merge pull request #605 from rwcarlsen/cyc-header

create cyclus.h. added missing header install. fixes #572.
moved all dynamic loading into xml_file_loader. Added a method for listing installed/discoverable dynamic modules to env class.

added rng schema methods to test models and removed rng files from them. removed rng installation from cmake module macro.

added master and module schema dumping to cyclus binary. added schema model test (that schema parses).