minor error on bc.aspect_ratio()

Signed-off-by: Gabriel Vigliensoni <gabriel@vigliensoni.com>
Fix error in bc aspect ratio

Signed-off-by: Gabriel Vigliensoni <gabriel@vigliensoni.com>
Merge branch 'master' of github.com:DDMAL/barlineFinder

Signed-off-by: Gabriel Vigliensoni <gabriel@vigliensoni.com>

Conflicts:
	barfinder.py