2015-01-01  Wush Wu <wush978@gmail.com>

- Version 0.8
- Use the implementation of murmurhash3 from the package digest
    - Update the author list
- Fix the following bugs
    - Undefined behavior due to big endian system
    - Inconsistent interaction result due to big endian system
    - Incorrect indices when expanding tag feature. See #27
- Correct some document errors in DESCRIPTION and Manual
