Parse file like .gitignore.
I write this because, there are no good ignore parsers lib for python.
ign = Ignore(['foo/', '/*/*.pyc', '*.txt'])
print ign
names = ['/log/foo/', '/foo', '/bar/', '/x.pyc', '/foo/a.pyc', '/foo/a.py', '/foo/a.txt']
print 'names', names
print ign.exclude(names)
print ign.filter(names)
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