v0.5.0

Behavior Changes

• DumpAll(), DumpDoc(), DumpFields() methods removed (#429)
• New method to create in-memory indexes (#452)

Enhancements

• New experimental indexing scheme smolder
• All bleve utilities migrated to single bleve cmd (#430)
• Index upside_down performance optimizations
• Searcher performance optimizaitons

Bug Fixes

• Tokenizer regexp no longer produces empty tokens
• Shingle filter now stateless, was producing bogus output (#431)
• Fix panic in collector when skipping more than total hits (#453)