Better to not unmarshal the schema dependent source.
Add _analyzer, _parent, _routing, _size, _source and _type to MappingOptions
Merge pull request #135 from dpetek/hotfix-mappingOptions

Add _analyzer, _parent, _routing, _size, _source and _type to MappingOptions
Merge pull request #133 from birkirb/master

Better to not unmarshall the schema dependent source.
Make routing, analyzer, type, parent, size and source optional (not included into json if not initialized)
indicesputmappings formating updated using gofmt
Merge pull request #136 from dpetek/hotfix-optionalMappingsOptions

Routing, parent, type, size, source and analyzer are optional in MappingsOptions