Several cleanups to many modules:

* Fix docs to specify when python2.6+ is required (due to a library
  dep).  This helps us know when it is okay to use python2.6+ syntax in
  the file.
* remove BabyJson returns.  See #1211  This commit fixes all but the
  openstack modules.
* Use if __name__ == '__main__' to only run the main part of the module
  if the module is run as a program.  This allows for the potential to
  unittest the code later.

lib/ansible/modules/cloud/amazon/ec2_ami_find.py

@@ -130,6 +130,7 @@ options:
     default: 'success'
     required: false
 requirements:
+  - "python >= 2.6"
   - boto
 
 '''

lib/ansible/modules/cloud/amazon/rds.py

@@ -241,7 +241,9 @@ options:
     default: null
     aliases: []
     version_added: 1.9
-requirements: [ "boto" ]
+requirements:
+    - "python >= 2.6"
+    - "boto"
 author: Bruce Pennypacker, Will Thames
 '''