RT mode and 32/64/FAT added
Merge branch 'master' of https://github.com/carthach/essentia into carthach-master

- New config param --lightweight=LIBS to specify dependencies to be included
- Ignore examples depending on libav/libsamplerate if missing
- Ignore MonoLoader and dependent algos if missing libsamplerate
- Make all dependencies optional
- fftw is still hardcoded to be mandatory until a generic FFT will be implemented
- remove flag for linking libyaml on squeeze (outdated)

Conflicts:
	wscript
Merge branch 'carthach-master'
Merge branch 'master' of https://github.com/MTG/essentia