Bump to 0.7.0

Bump the version to a new branch so we can test before releasing.

package.json

@@ -7,7 +7,7 @@
   "name": "solr-client",
   "main": "./main",
   "description": " A Solr client library for indexing, adding, deleting, committing, optimizing and searching documents within an Apache Solr installation (version>=3.2)",
-  "version": "0.6.1",
+  "version": "0.7.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/lbdremy/solr-node-client"