couchdb 1.7.2

[jcgraybill]

Update to 1.7.2, highest version released in this major version. Compatible with (but does not require) the erlang version upgrade in #1344.

[sevan]

Unable to test on Tiger as Spidermonkey build fails due to a call to OSAtomicCompareAndSwapPtrBarrier() in js/src/jslock.cpp which is lacking in Tiger. OSAtomicCompareAndSwapPtrBarrier() first showed up in Leopard.
Will try and get this tested on Leopard and merged tomorrow.

[sevan]

Tried to build on Snow Leopard but there's a problem with Tk build regarding the Aqua GUI API so I haven't been able to reach the point where it can attempt to build couchdb yet.

Regarding Spidermonkey, there's mozjs 24.2.0 which seems to be the last version before the source was integrated into firefox and separate source releases were made available (need to download several hundred megabytes of firefox source to build spidermonkey or to find out it no longe builds)

[jcgraybill]

Yikes, so Leopard is the sweet spot for a simple couchdb build.

I'm going to get access to Tiger and Snow Leopard test machines next week: I'm happy to put a pin in this PR and work on the issues you've found once those arrive.