More README.rst polishing.
More README.rst polishing.

simudream/pyFFTW,frederikhermans/pyfftw-arm,hgomersall/pyFFTW,frederikhermans/pyfftw-arm,simudream/pyFFTW,jonathanessen/pyFFTW,hgomersall/pyFFTW,drwells/pyFFTW,drwells/pyFFTW,simudream/pyFFTW,drwells/pyFFTW,jonathanessen/pyFFTW,jonathanessen/pyFFTW,hgomersall/pyFFTW,simudream/pyFFTW,drwells/pyFFTW