Initial commit
	new file:   boost/math/special_functions/bessel_derivatives.hpp
	new file:   boost/math/special_functions.hpp
	modified:   boost/math/special_functions/bessel_derivatives.hpp
	modified:   README.md
	modified:   boost/math/special_functions/bessel_derivatives.hpp
Asymptotic expansions for large argument are added.
	modified:   boost/math/special_functions/bessel_derivatives.hpp
	new file:   boost/math/special_functions/detail/bessel_jy_derivatives_asym.hpp
	Precision for amplitude is improved
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_asym.hpp
	Taylor series for BesselJ' and BesselY' small arguments are
	added.
	modified:   boost/math/special_functions/bessel_derivatives.hpp
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_asym.hpp
	new file:   boost/math/special_functions/detail/bessel_jy_derivatives_series.hpp
	Fix: itrunk function is'not fully qualified for ADL lookup.
	modified:   boost/math/special_functions/bessel_derivatives.hpp
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_asym.hpp
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_series.hpp
	Fix: series for small x and v = 0 are fixed.
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_asym.hpp
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_series.hpp
cyl_bessel_j_derivative and sph_bessel_derivative are tested.
	new file:   libs/math/test/bessel_j_derivative_data.ipp
	new file:   libs/math/test/bessel_j_derivative_int_data.ipp
	new file:   libs/math/test/bessel_j_derivative_large_data.ipp
	new file:   libs/math/test/sph_bessel_derivative_data.ipp
	new file:   libs/math/test/test_bessel_j_derivative.cpp
	new file:   libs/math/test/test_bessel_j_derivative.hpp
Fix: Always return non-null from cyl_neumann_derivative series term
eval.
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_series.hpp
cyl_neumann_derivative and sph_neumann_derivative are tested.
	new file:   libs/math/test/bessel_y01_derivative_data.ipp
	new file:   libs/math/test/bessel_yn_derivative_data.ipp
	new file:   libs/math/test/bessel_yv_derivative_data.ipp
	new file:   libs/math/test/sph_neumann_derivative_data.ipp
	new file:   libs/math/test/test_bessel_y_derivative.cpp
	new file:   libs/math/test/test_bessel_y_derivative.hpp
cyl_bessel_i is tested. A few new expected results are added.
	new file:   libs/math/test/bessel_i_derivative_data.ipp
	new file:   libs/math/test/bessel_i_derivative_int_data.ipp
	new file:   libs/math/test/test_bessel_i_derivative.cpp
	new file:   libs/math/test/test_bessel_i_derivative.hpp
cyl_bessel_k_derivative is tested.
	new file:   libs/math/test/bessel_k_derivative_data.ipp
	new file:   libs/math/test/bessel_k_derivative_int_data.ipp
	new file:   libs/math/test/test_bessel_k_derivative.cpp
	new file:   libs/math/test/test_bessel_k_derivative.hpp
Refactoring: Constness is added. Count of multiple temporaries is reduced.
	modified:   boost/math/special_functions/detail/bessel_jy_derivatives_asym.hpp
Fix: tag dispatching for optimisation is added.
See bessel_derivatives_linear.hpp.
	modified:   boost/math/special_functions/bessel_derivatives.hpp
	new file:   boost/math/special_functions/detail/bessel_derivatives_linear.hpp
change log(2) to constants::ln_two<T>()
Merge pull request #1 from jzmaddock/patch-1

change log(2) to constants::ln_two<T>()