started on .Verbatim() queries support
Merge branch 'master' into verbatim-queries

Conflicts:
	src/Nest/DSL/QueryDescriptor.cs
implemented .Verbatim() for filter and query and wrote unit tests for them
Merge pull request #417 from funnelfire/asyncbulkoninterface

added async bulk to IElasticClient
added support for ScriptScore in FunctionScore

http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/query-dsl-function-score-query.html#_script_score
added support for ScriptScore in FunctionScore
Merge pull request #419 from V1tOr/master

added support for ScriptScore in FunctionScore