added methods to set min&max of a slider
added getter for min&max of ofxSlider
Merge pull request #2819 from fx-lange/feature-ofxslider

feature request: added methods to set min&max of a slider
Fix for issue with UDP multicast socket on OSX.

Previously I was unable to bind multiple listeners to the same multicast
socket as OSX seems to require SO_REUSEPORT option to also be set on the
socket.

Resolves #2937.
Merge pull request #2939 from tsungg/bugfix-osxudp-multicast

Fix for issue with UDP multicast socket on OSX.
ofxGui: fix bugs in last commit
update CHANGELOG
Merge branch 'master' of https://github.com/openframeworks/openFrameworks.git into rexgo
ofFbo: fix min/max filters settings
Merge branch 'master' of https://github.com/openframeworks/openFrameworks.git into rexgo