.gitignore: tighten ignore rules in jnius/

Tighten the ignore rules for jnius/jnius.c, jnius/jnius.so, and add a
rule for jnius/config.pxi.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
docs/source/android: add note about nested classes

Right after the first DPI example, write a short note demonstrating
the use of autoclass() with nested classes using the `$` character.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Merge pull request #52 from artagnon/master

A couple of quick fixes