Fix errors in generalization of binomial coefficient.  Provided corrected definition for negative integer exponents.

modified:   ../../env/.aspell.en.prepl
modified:   ../../env/.aspell.en.pws
modified:   ../METADATA
modified:   mathematica/huang93relativisiticGas.nb
new file:   mathematica/negativeBinomial.nb
modified:   nonIntegralBinomialSeries.tex