Update nack dependency for better json behavior

Fixes 37signals/pow#378 and fixes 37signals/pow#416
Don't double-pause rack requests

Requests are already paused at the point they reach the rack handler. Pausing
them a second time causes data corruption when handling large inbound requests
(such as big file uploads). This happens when the second pause is called before
the full request is received. For a short time, data events are recorded and
then replayed twice.
Build with vendored CoffeeScript version
Fix failing DnsServer test by hard-coding a port
Pow 0.4.2
Vendor Docco
Merge pull request #424 from kjg/patch-1

Update nack dependency for better json behavior
Pow 0.4.3
Change 37signals to basecamp
Use full path to /bin/sh in cx.pow.firewall.plist ProgramArguments.
Merge pull request #444 from mcmorgan/change-37signals-to-basecamp

Change 37signals to basecamp
Merge pull request #458 from futureimperfect/master

Use full path to /bin/sh in cx.pow.firewall.plist ProgramArguments in case PATH is unset