mod: versions of dependencies

Author: qiao

package.json

@@ -10,10 +10,10 @@
       "heap"            : ">= 0.2.0"
   }
   , "devDependencies" : {
-      "coffee-script"   : ">= 1.3.0"
-    , "mocha"           : ">= 1.0.1"
-    , "should"          : ">= 0.6.0"
-    , "browserify"      : ">= 1.10.4"
+      "coffee-script"   : "1.3.x"
+    , "mocha"           : "1.0.x"
+    , "should"          : "0.6.x"
+    , "browserify"      : "1.10.x"
     , "uglify-js"       : ">= 1.2.5"
   }
   , "repository"      : {