Buffalo

Bug Fixes
- hotfix, backward compatibility for pbar, iter_pbar

Bug Fixes
- Fix numerical error when calculating training loss in conjugate gradient method(CPU implementation only)
- Fix broken print out for progress bar.

Misc
- No longer need root permission for installation.

Bug Fixes
- Correct illegal Python Index Package(PIP). (Added missing files to MANIFEST)

Misc
- Apply https://github.com/kakao/buffalo/issues/10
- Update unittest for travis-ci environments.

Misc
- Added travis-ci (WIP)
- Added examples/Dockerfile 7
- Correct stream default option(disable sppmi)

Misc
- Fix memory corruption error when using optimize feature of ALS
- Correct typos