charybdis 3.4.2, HEAD

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Right now it does not compile with `clang` so I followed the guide and added the `fails_with :clang` block. Then `homebrew-dupes/apple-gcc42` provides a working compiler for it. 

I have tested both 3.4.2 and --head on OS X 10.9.

Can a test be added to do something more substantial than e.g. `--version` or `--help`? See `cmake.rb` for an example of an application formula with a good test and `tinyxml2.rb` for an example of a library formula with a good test. Thanks!