[erlang-patches] Support ** for recursion in filelib:wildcard

[José Valim]

Here is an updated patch for ** support in filelib:wildcard().

git fetch git://github.com/josevalim/otp.git fixed_double_star

https://github.com/josevalim/otp/compare/fixed_double_star
https://github.com/josevalim/otp/compare/fixed_double_star.patch

Quoting from bash documentation:

Two adjacent *'s used as a single pattern will match all files and zero or
more directories and subdirectories.

I have tested this against Bash 4.2 implementation (previously I was using
Ruby's implementation as basis). Since I didn't know there was a difference
between Ruby and Bash, I removed any reference to Ruby in the commit
message.

I have also kept the current filelib:wildcard() behavior of returning files
that start with dot ".". Bash by default does not return files starting
with "." in wildcards.

I have also improved the test coverage, documentation and added some
examples.
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