Merge pull request #23 from ciubotaru/unstable

Merging unstable into master
Merge pull request #31 from ciubotaru/unstable

Unstable
Merge pull request #32 from ciubotaru/unstable

Merging unstable into master. Releasing 0.5.1
Merge pull request #36 from ciubotaru/unstable

Unstable
Merge branches 'unstable' and 'master' into unstable