Modified env fact gathering to use the native python method

Also updated CHANGELOG for this feature

CHANGELOG.md

@@ -18,7 +18,8 @@ New modules:
 
 Misc changes:
 
-* Added `state=touch` to the file module, which functions similarly to the command-line version of `touch`
+* Added `ansible_env` to the list of facts returned by the setup module.
+* Added `state=touch` to the file module, which functions similarly to the command-line version of `touch`.
 * Added a -vvvv level, which will show SSH client debugging information in the event of a failure.
 * Includes now support the more standard syntax, similar to that of role includes and dependencies. It is no longer necessary to specify a special "vas" field for the variables passed to the include.
 * Changed the `user:` parameter on plays to `remote_user:` to prevent confusion with the module of the same name.  Still backwards compatible on play parameters.

library/system/setup

@@ -459,19 +459,9 @@ class Facts(object):
         self.facts['user_id'] = getpass.getuser()
 
     def get_env_facts(self):
-        env_bin = module.get_bin_path('env')
-        (rc, out, err) = module.run_command(env_bin)
-        if rc == 0:
-            self.facts['env'] = {}
-            i = 0
-            for line in out.split('\n'):
-                if len(line) > 0:
-                    try:
-                        (k,v) = line.strip().split('=',1)
-                        self.facts['env'][k] = v
-                    except ValueError, e:
-                        self.facts['env']['ansible_error#%d' % i] = line
-                        i = i + 1
+        self.facts['env'] = {}
+        for k,v in os.environ.iteritems():
+            self.facts['env'][k] = v
 
 class Hardware(Facts):
     """