extlib messes with Kernel.exec - just remove it?

[mltsy]

For some reason, Kernel.exec breaks when Array#to_hash is defined, if it's used in this form: Kernel.exec ['/bin/ls', '/bin/ls'], '-al'

extlib defines Array@to_hash, and selenium-webdriver uses Kernel.exec in this form, and therefore things that use selenium-webdriver (i.e. capybara) can't be used in projects that include extlib.

I don't even see it being used, unless I'm mistaken. It looks (from git blame) like it was added for a single instance of using String#camel_case, but that's no longer in the codebase, so I wonder if it could just be removed without consequences.