Merge pull request #151 from petercolberg/master

Allow attribute reading/writing for HDF5File
Support for new libhdf5 names in Debian

As suggested in issue #153.
Thanks!
Merge pull request #154 from pini-gh/patch-1

Support for new libhdf5 names in Debian
Read and write BigInts and BigFloats

Also a hack to make reading Complex data a little faster, which I
should eventually generalize to any immutable with the same on-disk
and in-memory structure.
Fix #156
Improve handling of None type. Fixes #157
Fix memory leaks

- Free or manage memory for strings
- Ensure that datatypes are closed when necessary

Fixes #136, #155
Prevent premature compilation of h5convert_vals
Allow mmapping a dataset as an array of any type

Fixes an issue mmapping complex data
Fix for changes in 0.4 Dict syntax
Use more specific VERSION
Create attribute with Unicode name