Fixes #20 Posting with knockout templates

@gholtslander @jrans-va

Posts now use knockout templates instead of php string substitutions. I think it looks pretty sweet, but I am excited to see the diff on GitHub
Since these are being used in more than one place, I figure I can bust this out. Hmm, maybe it makes sense to put the "convenience links" somewhere else, now that this PostModel is "exposed" to end users.