Grunt mocha test file existence check
Grunt mocha test file existence check

This is a small tweak to a recent commit that does an up-front
check to confirm the mocha test exists. It had failed to check
the condition where the user was trying to run a .js mocha test
for a ,jsx file that hadn't yet been compiled. This expands on the
existence check for a .jsx version of the file.

garrensmith/couchdb-fauxton,robertkowalski/couchdb-fauxton,popojargo/couchdb-fauxton,cloudant/couchdb-fauxton,popojargo/couchdb-fauxton,garrensmith/couchdb-fauxton,apache/couchdb-fauxton,popojargo/couchdb-fauxton,robertkowalski/couchdb-fauxton,michellephung/couchdb-fauxton,benkeen/couchdb-fauxton,popojargo/couchdb-fauxton,cloudant/couchdb-fauxton,benkeen/couchdb-fauxton,garrensmith/couchdb-fauxton,apache/couchdb-fauxton,michellephung/couchdb-fauxton,apache/couchdb-fauxton,michellephung/couchdb-fauxton,garrensmith/couchdb-fauxton,michellephung/couchdb-fauxton,cloudant/couchdb-fauxton,michellephung/couchdb-fauxton,benkeen/couchdb-fauxton,cloudant/couchdb-fauxton,robertkowalski/couchdb-fauxton,apache/couchdb-fauxton,robertkowalski/couchdb-fauxton