Added annotation parsers.
Added documents for indexing.
Completed sugggestions indexing functionality.
Added context suggester DSL.
Added suggestions iterator.
Added elasticsearch suggest api implementation.
Added missing functional tests for suggesters.
Added documentation for suggesters.
Moved required test data from testing bundle.
Added missing sorting for suggestion tests.
Merge pull request #64 from Zylius/autocomplete

Added autocomplete.