Merge branch 'hyper_exponential' into feature/hyperexponential_dist
Merge branch 'hyper_exponential' into feature/hyperexponential_dist
[distributions] Hyper-Exponential: added include file for macro BOOST_NO_CXX11_HDR_INITIALIZER_LIST and removed 'const\&' from 'std::initializer_list' (as from (Stroustrup,TCPL4e).
[distributions] Hyper-exponential: expanded 'Applications' section, added 'Examples' section, and updated synopsys and reference with new constructors.
[distributions] Hyper-Exponential: added include of 'iterator' for 'std::distance' and aesthetic changes.
Doc update