Relax the number of orthogonal topic fragments to recover

• Relax the number of orthogonal topic fragments to recover
• Compute projection dimension for Randomised SVD following theoretical bounds

Ref:
Samet Oymak, Joel A. Tropp, Universality laws for randomized dimension reduction, with applications.

Minimise and refactor

• Minimised the number of hyper-parameters
• Fine-tuned determination of sign of every factor vector
• l1-simplex projection of beta disabled by default
• Rename Organisation to megadata, refactored the class hierarchy
• Minimal build.sbt. The repo is ready to be Published into any public Maven Repository e.g http://central.sonatype.org/pages/ossrh-guide.html
• Updated usage guide in README

Maintenance

• Fix for Spark 2.1.0