[#7] Add support for optimised bgeo implementation.

Allow switching between implementations within node.
[#7] Fix node name reference.

Note: Not sure why the fully qualified name doesn't work.
[#7] Raise appropriate error so more information can be displayed.
[#7] Fix name processing to work correctly with Maya's logic.
[#7] Return target node from package load.

Allow other processes to operate further on node.
[#7] Store additional metadata in package file (start and stop frames).

For other processes to quickly determine frame range.
[#7] Add command line interface to optimise package for Houdini.

Generate bgeo from Segue node and add to package.
Merge pull request #8 from 4degrees/7_optimise_for_houdini_by_writing_out_bgeo

Fix #7: Optimise for houdini by writing out bgeo