Use JNA/JFFI from JRuby to implement POSIX features

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The libraries used by JRuby to implement POSIX and other native features are now hosted at github: http://github.com/wmeissner/

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Initial code for this is already contained in the file module in the chmod() and symlink() functions.

http://github.com/ringo/ringojs/blob/941eaadf55326d3d6b022c5afab87ef222bbf7f4/modules/file.js#L151-171

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Note: a quick way to get these running is to copy the files jaffl.jar jffi*.jar jna.jar jnr.posix.jar from the build_lib directory in jruby somewhere into the ringojs lib directory.

http://github.com/jruby/jruby/tree/master/build_lib/

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Jython's implementation:

http://jython.svn.sourceforge.net/viewvc/jython/trunk/jython/src/org/python/modules/posix/

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I just pushed initial support to my fork: 1476fe9

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closing