Two changes for a release:

1. Increment the version to be 0.3
2. In the setup, copy all versions of the messenger.
Incremented version towards development of 0.4
Working towards a better build experience.
Use maxint to differentiate 32 bit from 64 bit Windows.
Merge pull request #73 from arokem/build

Working towards a better build experience.
Remove numpy use from pymatbridge.py.
Merge pull request #76 from isbadawi/less-np

Remove numpy use from pymatbridge.py.
Rename json functions away from +pkg syntax.
Use Octave-compatible syntax for calling Java.
Add support for invoking Octave instead of Matlab.

* Extract most of the Matlab class into a base Session class
* Matlab and Octave are subclasses that tweak the command line
  invocation
* Eliminate some code duplication along the way
s/Session/_Session/, and restore its docstring
Use appropriate program name in output.
Make test suite runnable with Octave.
Fix messenger compile errors on gcc / clang.
Mention Octave support in README.
Merge pull request #75 from isbadawi/octave

Octave support
Fix json paths in version.py.
Merge pull request #78 from isbadawi/patch-1

Fix json paths in version.py
Make codebase python3 compatible.
RF: The format expected by publish_display_data is a list of dicts.