auto merge of #5329 : wanderview/rust/std-getopts-opts_present, r=graydon
Currently the opts_present() function only checks to see if the option is configured in the match, but doesn't actually check to see if the option value has been set. This means that opt_present('h') may return false while opts_present([~'h']) returns true. Add a test case to catch this condition and fix opts_present() to check the value before returning true. Note, there is another API difference between these two functions that this does not address. Currently if you pass a non-configured option to opt_present() the program will fail!(), but opts_present() simply returns false. If it is acceptable to standardize on the fail!() then opts_present() should probably be implemented in terms of the opt_present() function.
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