Merge branch 'version/bump'

Bump to 2.1.5dev
fix link tutorial.navigation in index.rst
Fixed typo in tutorials
Merge pull request #726 from Spabby/master

bugfix/index.rst
Thanks Gary
Merge pull request #725 from samsonasik/fix-linkindex

fix link tutorial.navigation in index.rst

Conflicts:
	docs/languages/en/index.rst
Merge branch 'hotfix/725' into develop

Forward port #725