Update version number and changelog

ChangeLog.txt

@@ -1,3 +1,7 @@
+2012.05.15 Version 0.7.5
+* Fixed registration hubs issue with requiring access key when shared key was provided.
+* Fixed registration hubs issue with listByTag, Channel and device token
+
 2013.05.09 Version 0.7.4
 * Fixed encoding issue with partition and row keys in table storage query
 

package.json

@@ -10,7 +10,7 @@
     "Rodrigues, Andre <andrerod@microsoft.com>",
     "Tavares, Chris <ctavares@microsoft.com>"
   ],
-  "version": "0.7.4",
+  "version": "0.7.5",
   "description": "Windows Azure Client Library for node",
   "tags" : ["azure", "sdk"],
   "keywords": [ "node", "azure" ],