Use Python 3 compatible exception syntax.
Use Python 3 compatible libraries when running in Python 3.

Not quite working! There is an ImportError for the pystache library that I’m still trying to figure out.
Update chardet library to Python 3 compatible version.

Source: https://github.com/scharron/chardet
Fix broken imports. Move pystache for Python 3 to python3 subdir.
Move Pystache for Python 3 back to main package directory.

Having it in a subdirectory broke it in Sublime Text 3.
Update README for ST3 compatibility
Upgrade pystache library to version compatible with Python 2 and 3.
Merge branch 'refs/heads/python3'
Remove debug output.
Update install/upgrade messages for version 1.4.0.