declare parameter "inputSize" for algorithm MFCC
git ignore vim tmp file
specify numpy's include path explicitly

when building essentia WITH_PYTHON in a virtualenv environment, it shows
the error:

    ../src/python/essentia.cpp:32:31: fatal error: numpy/arrayobject.h: No
    such file or directory

it's better to specify the include path explicitly
Merge pull request #34 from mckelvin/master

declare parameter "inputSize" for algorithm MFCC, misc