fix a hmmRecSmoother

Merge pull request PRML#33 from sth4nth/master

updated readme

Merge pull request PRML#31 from sth4nth/master

1.0 update

Merge pull request PRML#28 from sth4nth/master

refined all docs, all test passed

Merge pull request PRML#27 from sth4nth/master

fixed issue PRML#15

Merge pull request PRML#8 from sth4nth/master

version update

Update README.md