Add support for multiple instances of the same resource

[Wiston999]

Changes proposed to fix #97.

It adds support for multiple resources created under the same type and name. This is the use case when count or for_each are used.

Additionally:

• Modify state representation to add resource index
  
• Modify search table to add resource type and resource index under "Resource ID" column
  

[coveralls]

Coverage decreased (-0.2%) to 15.541% when pulling ead7125 on Wiston999:for-each-resources into a7ada9f on camptocamp:master.

[raphink]

LGTM. Thank you!