Bump NPM version to 0.7.0 in preparation for publishing.

Author: benjamn

package.json

@@ -12,7 +12,7 @@
     "parsing",
     "pretty-printing"
   ],
-  "version": "0.6.10",
+  "version": "0.7.0",
   "homepage": "http://github.com/benjamn/recast",
   "repository": {
     "type": "git",