Mixxx 2.1.5

Mixxx 2.1.4

release Mixxx 2.1.3

This is the replacement tag, for the original releas-2.1.2 tag

accidentally pointing the master branch. If you don´t see
the original tag on this commit, please call
git tag -d release-2.1.2
git fetch upstream
to fix this

Mixxx 2.1.2

Merge pull request mixxxdj#1707 from Be-ing/2.1_windows_build

fix 2.1 build with Qt4 on Windows

release Mixxx 2.1 (mixxxdj#1608)

Added ronso0 to the conributor list. Thank you for all the great work…

… and making Tango real.

Add a note about versioning.

tag for RC2