Release candidate for beta 0.2 release

Changelog

New Features

• MVS-Texturing: new texturing algorithm vastly improves blending, seam leveling, color correction, and overall quality
• Updates OpenSfM to more recent version
• Optional ability to install with semi-global matching point cloud densification technique. See here

Minor changes

• More streamlined installation
• Improves Docker installation (note changed process in readme)
• Parallelization of early tasks
• Bug fixes and code cleanup