Merge pull request #1 from sksamuel/master

Synchronize with latest elastic4s master as of 10/24/14
Merge remote-tracking branch 'upstream/master'

Merging with latest elastic4s master
Added the deleteMapping and the typesExist to the ElasticClient class
Merge pull request #250 from hfgiii/master

 	Added the deleteMapping and the typesExist methods to the ElasticClient class