Add option to static link hdf5 and bitshuffle #64

HDF5 and bitshuffle are the dependencies causing most grief. The common issues are:

1. Needing the C++ API which is a separate package from the C API and cmake doesn't always reliably pick up both from the same location (issue I've seen with conda)
2. The version used to link is different from the runtime version. This can happen on a system with conda, but is probably also an issue with the manylinux wheels on different systems
3. bitshuffle path is screwed up or there's some other runtime issue finding the plugins which is also a different package

I think a clean solution to this would be just statically link hdf5 and bitshuffle. It's not necessarily ideal, but would make us a bit more robust to the above issues and shouldn't take too much time.