First version of meta inventory.
Updated name to multi_ec2 instead of meta.
Updated with the class name.
In order to agree with previous renaming these naming changes were made.
Fixed naming for chache file.
Updated merge function to merge recursively
Updated the function name to accurately reflect its procedure.
suppress error unbound variable
Merge pull request #34 from kwoodson/meta_inventory

Adding a meta inventory to query multiple cloud accounts.
Merge pull request #35 from liangxia/master

suppress error unbound variable