Revert "update installation instructions with note about newest ubuntu"

ubuntu node package is completely fucked.
This reverts commit 634015bc89.

README.md

@@ -37,8 +37,7 @@ Groove Basin is undergoing heavy restructuring. When this gets to a good
 checkpoint, we will cut a release. Until then, use these instructions to
 run from source:
 
-1. Install [Node.js](http://nodejs.org) v0.10.15 or greater. If you're using
-   Ubuntu 13.10 "Saucy Salamander" you can `sudo apt-get install nodejs`.
+1. Make sure you have the latest stable [Node.js](http://nodejs.org) installed.
 2. Install [libgroove](https://github.com/superjoe30/libgroove).
 3. Clone the source.
 4. `npm run build`

package.json

@@ -10,7 +10,7 @@
     }
   ],
   "engines": {
-    "node": ">=0.10.15"
+    "node": ">=0.10.20"
   },
   "repository": {
     "type": "git",