PyJnius conversion

PyJnius is a reflection-based Python-JVM bridge, much more akin to
Matlab-Java or rJava. The major up-side is that the casting is gone
from the Python API. Some issues to address before merging:

1. There's no auto-boxing of numeric arguments, so
java.util.HashSet#add(1) fails
2. Java iterables aren't automatically Python iterables.
ovation.conversion.iterable works, but we should push a patch upstream
to Jnius that auto-wraps Java iterables
3. Jnius ML suggests there are Windows issues. Need to be checked (and
resolved) before merging.
Tackling number (non)auto-boxing
skip mvn_opts
Python API unit tests pass under jnius
Mods for neo importer

1. Logging is now in ovation.core to avoid conflict with stdlib logging
2. Added conversion.asclass for casting—jnius sometimes only gives you
the interface, not a fully-fuctional class
Correction for asclass name mangling
Upping test coverage and tox.ini
Additional tests for asclass(None) and mult-element dataframe
All tests passing under jnius
Draft Windows support

All tests pass, but the README needs serious attention
Move examples to examples/
mvn subprocess call check win32
Updated for phyjnius
Merged from master
Merge pull request #3 from physion/pyjnius

Replace JCC with jnius