Merge pull request #421 from Locu/unicode-err

Fix for python 2.x compatible unicode encoding of strings
Merge pull request #420 from Locu/upstream

Add test case and bug fix for double serialization of delete_by_query qu...
Added missing aggregation 'missing' and test for it
Merge pull request #422 from julianhille/master

Added missing aggregation 'missing' and test for it
Bugfix: fixed https://github.com/aparo/pyes/issues/350
Feature: added two new Aggs (MinAgg and MaxAgg)
also added an integration test for them
Merge pull request #423 from julianhille/feature/aparo_350_fix

Bugfix: fixed https://github.com/aparo/pyes/issues/350
Merge pull request #424 from julianhille/feature/min_max_agg

Feature: added two new Aggs (MinAgg and MaxAgg)
Added ReverseNestedAgg (which where missing).
Added test for NestedAgg and ReverseNestedAgg

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-bucket-reverse-nested-aggregation.html#search-aggregations-bucket-reverse-nested-aggregation
Merge pull request #425 from julianhille/feature/reverse_nested_agg

Added ReverseNestedAgg (which where missing).
Add ignore_conflicts parameter to put_mapping
Merge pull request #428 from ubergrape/master

Add ignore_conflicts parameter to put_mapping
Merge remote-tracking branch 'upstream/master'