Merge pull request #20 from anha0825/master

New hackney return type
added support for creating mappings
Merge pull request #21 from inaka/mapping

Added support for creating mappings
Merge branch 'master' of github.com:tsloughter/erlastic_search

Conflicts:
	src/erlastic_search.erl
Remove empty spec attribute from doc, crashes edoc.
Delete index
Merge branch 'master' into jiffy