Set random seed value to ensure tests always pass
Set random seed value for denoising tests
Swapped the direection that the histograms point in the hog visualisation
Merge pull request #420 from ahojnnes/random-seed

TST: Set random seed value to ensure tests always pass.
Merge pull request #422 from colincsl/hog_visualisation

HOG Visualisation bugfix
Do not install the doc package
Merge pull request #423 from cgohlke/patch-1

Do not install the doc package