Lazy cascading implementation in HDF5 IO
Add load_lazy_object() method
Do not return cached object when fully loading a lazy object
Changed cascade parameter from 0/1/2 to False/True/'lazy
Improved save performance
Fixed: Lazy cascading with multiparent objects that miss one parent
Merge branch 'master' of github.com:NeuralEnsemble/python-neo into LazyCascade
Lazy cascading documentation
Docstrings
Unit tests for lazy cascading and loading lazily loaded objects
More NeoHdf5IO unit tests
Fixed some spike train tests for 32 bit platforms
Merge remote-tracking branch 'origin/LazyCascade' into LazyCascade

Conflicts:
	neo/io/hdf5io.py
Remove unneeded print statement
Merge pull request #27 from rproepp/LazyCascade

Lazy cascade