[TASK] Skip index not used by the current application in Mapping Command

By default the current Mapping CLI tools show all indexes configured in
ElasticSearch. When the ES server is used by other applications, the
command output is bloated by unneeded informations.

This patch add a method to the IndexInformer to skip ES indexes not
declared in the Flow application.
[TASK] Fix wrong label in Transfer\Exception message
Merge pull request #8 from Flowpack/fix-exception-message

[TASK] Fix wrong label in Transfer\Exception message
[TASK] Add CLI command to create, delete and refresh an index
[TASK] Add custom indexes settings support

This change add a way to set and update custom index settings
Merge pull request #9 from ttreeagency/feature/CreateAndDeleteIndex

[TASK] Add CLI command to create, delete and refresh an index
[TASK] Don't try to converge index if the index does not exist

Display an error message if the current index does not exist
Merge pull request #10 from ttreeagency/feature/DontConvergeIfIndexDoesNotExist

[TASK] Don't try to converge index if the index does not exist