new API function -- get qual info

… to retrieve chemName and units
updated hash methods. just increasing the size of the hash helps a lot with loading larger networks. perhaps hash could be extended to dynamically size based on network size.
adding Model* object wrapper, to allow better encapsulation.
TO-DO: create new API variations that take the wrapper pointer as first argument
checkout file
Merge pull request #15 from samhatchett/obj_wrapped

wrapping up the globals