rename mochijson2

[motobob]

we should not copy code form other repos with the same name so at least rename it.
i do not want to put whole mochiweb as a dependancy intentionally.
Otherwise it's not possible to use both rabbit_common and original mochiweb

[ssawan623]

This would be great! Any way this could be merged?

[dch]

As mochijson2.erl is a drop in copy-pasta module, any other library using mochi* will fail to generate a release:

ERROR: generate failed while processing /projects/widget/rel:
  {'EXIT',{{badmatch,{error,"Module mochijson2 potentially included by
    two different applications: mochiweb and rabbit_common."}},

Bumping this merge request

[tomtaylor]

Can we get this merged? It's caused a problem for us, and I suspect it'll catch a few other people out as well.