more comments in mixer
rename prototypes
mixer_crossfade works most of the times
add using_libcheese prototype
add gst-mixer.sh prototype
add ramp.py
Merge branch 'master' into crossfade
avoid public attributes
made some attributes privates
rename a var
Use filesrc and decodebin
towards playing two clips
It fades in

Still a bug when the files are over, though, I think.
add a videoscale just in case + other stuff
more .gitignore
remove some useless things and add potential leads