* Introduce MCI cache: Art files are hashed and MCI info (per client) is cached. Term resizes invalidate the cache

* Bring in farmhash for art file hashing (and perhaps other uses soon)
* Re-write of art.js display(). Better system, use MCI cache, etc.
* Update package.json engines node req.

package.json

@@ -31,9 +31,10 @@
     "string-format": "davidchambers/string-format#mini-language",
     "temp": "^0.8.3",
     "inquirer" : "^1.1.0",
-    "fs-extra" : "0.26.x"
+    "fs-extra" : "0.26.x",
+    "farmhash"  : "^1.2.0"
   },
   "engines": {
-    "node": ">=0.12.2"
+    "node": ">=4.2.0"
   }
 }