turn off chart animations. They make the site appear slower and don't
offer anything.
fixed #32: calc wOBA with season coefficients

Added statsConstantsService to store yearly coefficients for wOBA and
FIP. We can store other historical seasonal coefficients here as well.
The last statsYear of the filter is passed to calculateResults and
stored in results. Then getCoefficients(results.year) fetches the
coefficients.