Python 2.7 no longer supported, added Quickshift, Flatmap, Phow and Vlad

• Python 2.7 no longer supported as it is end of life and already conflicts with upgrades such as changing to miniver over versioneer (used for managing the auto-releases)
• Thanks to @hubutui, @simmimourya, @AlexisMignon and @YohaiDevir for their contributions - particularly @simmimourya for all the contributions in improving feature parity with the Matlab vlfeat
• Also note a major bug fix in the HoG code for color images (#31) and a change in behavior for the Fisher model in expectations for the data matrix shape (#20)

Add HOG and Python 3.5 builds

Expose the HOG method and enable Python 3.5 builds.

Add Fisher

Thanks to @williamkreamer, cyvlfeat now supports the vl_fisher_encode method.

Added Dense Sift Code

Also, change the order in which data is processed to try and speed everything up.