.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
Merge branch 'master' into extend_class_support
fix crash in Java, it look like changing CreateLocalRef to CreateGlobalRef works, and retain correctly some references needed for the invocation. But i'm not entirely sure about the implication.
ident java
compile with debug info by default, can be stripped later
implement void return
reduce code
add DEBUG boolean in the java class
fix proxy tests, it works!
cleanup proxy code
add documentation for proxy, and for java signature format