Check for only python2 when building bindings
Check for only python2 when building bindings

Bump required python to 2.7 and check for numpy
during configure

MTG/essentia,MTG/essentia,MTG/essentia,carthach/essentia,carthach/essentia,carthach/essentia,MTG/essentia,carthach/essentia,carthach/essentia,MTG/essentia