Build ReadMe updates.

build/README.md

@@ -6,7 +6,13 @@ Note that this requires a familiarity with using the command line. The example c
 
 ### Install dependencies
 
-Node (0.10.2 or greater is required):
+sass (3.3 or greater is required):
+
+    # ruby is required for sass. Check http://sass-lang.com/install for dependencies.
+    # Install (or update) sass
+    gem install sass;
+
+Node (0.10.x or greater is required):
 
 	# check the version via the command line
 	node -v
@@ -61,4 +67,5 @@ The same as the NEXT process, but will not minify the source code. All code form
 * grunt next - Build everything using the NEXT version.
 * grunt combine - Build a NEXT version, but leave comments and formatting intact.
 * grunt docs - Build only the docs
-* grunt uglify - Create the PreloadJS min file. (Will use NEXT as the version)
+* grunt exportScriptTags - Export valid <script /> tags from the config.json file.
+* grunt nextlib - Export NEXT versions of the lib.