==========================
- Raise the limit of number of fields (previously 256 fields) (fulmicoton)
- Removed u32 fields. They are replaced by u64 and i64 fields (65) (fulmicoton)
- Optimized skip in SegmentPostings (130) (lnicola)
- Replacing rustc_serialize by serde. Kudos to KodrAus and lnicola
- Using error-chain (KodrAus)
- QueryParser: (fulmicoton)
- Explicit error returned when searched for a term that is not indexed
- Searching for a int term via the query parser was broken `(age:1)`
- Searching for a non-indexed field returns an explicit Error
- Phrase query for non-tokenized field are not tokenized by the query parser.
- Faster/Better indexing (fulmicoton)
- using murmurhash2
- faster merging
- more memory efficient fast field writer (lnicola )
- better handling of collisions
- lesser memory usage
- Added API, most notably to iterate over ranges of terms (fulmicoton)
- Bugfix that was preventing to unmap segment files, on index drop (fulmicoton)
- Made the doc! macro public (fulmicoton)
- Added an alternative implementation of the streaming dictionary (fulmicoton)