Support fot HDF5

[Merg1255]

@kapadia Have you considered creating a library also for HDF5 files?
Btw, which format do you use more often? Getting a JS version for common ones is a good way to transition to the browser.

[kapadia]

@Merg1255 Oh, this is an ambitious task! I've looked at the HDF5 specs a while back, but I'm not familiar enough to write a parser. Are you using this format?