rename gcf -> cf everywhere

This PR would be faster if someone merged it and fixed the other bits :)

On Sat, Aug 16, 2014 at 9:19 AM, Julian Friedman <notifications@github.com>
wrote:

>>      cd $GOPATH/src/github.com/cloudfoundry-incubator/pat
>>      gocart
>>  
>>  5) See [CF CLI] (https://github.com/cloudfoundry/cli) for instructions on installing `cf`
>>  
>> -Note: It is important that `cf` is accessable on your `$PATH`, and that it has either been symlinked to `gcf` or renamed to `gcf`.
>> +Note: It is important that `cf` is accessable on your `$PATH`, and that it has either been symlinked to `cf` or renamed to `cf`.
> This sentence doesn't make much sense now :-)
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