[MRG + 1] More versionadded everywhere! (scikit-learn#7403)

* insert versionadded versionchanged directives in docstrings for 0.18

indicate where exception classes were moved from

* moved versionadded in the proper places

Release 0.18rc2

Release 0.18rc1

Release 0.18rc

Release 0.17.1

MAINT ignore cythonize.dat generated by master branch

scikit-learn Debian release 0.17.0-4

scikit-learn Debian release 0.17.0-3

scikit-learn Debian release 0.17.0-1

scikit-learn 0.17 release