use node-glob instead of wildcard for better pattern support

[coltrane]

node-glob "is a glob implementation in JavaScript. It uses the minimatch library to do its matching."

https://github.com/isaacs/node-glob
https://github.com/isaacs/minimatch

This commit replaces "wildcard.js" with the equivalent (but more standardized, and full-featured) functionality from node-glob. This allows vows to be called, for example, like this:
vows --spec 'test/**/test-*.js'

Unlike the original wildcard functionality, the ** in the above pattern will now match all test-*.js files in all subdirectories of test/ recursively (not just direct children of test/). Numerous other nice features are supported as well -- see node-glob, and minimatch for details.

Note 1: this has not been tested on windows. Node-glob is reported to work on windows, but does include some caveats with regards to use of \ as a path separator. If this proves to be an issue, it could probably be addressed by simply replacing all backslashes with forward-slashes before calling glob.

Note 2: if anyone is relying specifically on the old non-recursive behavior of **, then this change will break them (though the fix would be trivial). Also, the glob package is sensitive to a number of other special chars that "wildcard.js" was not sensitive to. (see minimatch for specifics). Any special char can be escaped with a \ to preserve its literal value.

[adamstallard]

grunt-vows-runner uses node-glob to match files via grunt. You can also use templates to match files (also via grunt).

[JerrySievert]

anyone have any objections to pulling this in? it would also answer #269

[indexzero]

I am fine with this. Using modules is better anyway.