Prepare documentation for v0.4 release.

Prepare v0.3.6 release.

Prepare v0.3.5 release.

Prepare v0.3.4 release.

Update PyPI package for v0.3.3 release.

Prepare v0.3.2-beta release.

Prepare v0.3.1-beta release.

Prepare v0.3-beta release.

Bugfix for previous commit (missing character index for version strin…

…g check).

Added missing string index when determining OpenCV version.