New interface compatible with std::sort.

[pystraf]

I have added support for C++14 and above versions. The new project has a grailsort.hpp file that contains four export functions: grailsort:: grail_sort (GrailSort), grailsort:: grail_sort_buffer (GrailSortWithBuffer), grailsort:: grail_sort_dyn_buffer (GrailSortWithDynBuffer), grailsort:: rec_stable_sort (RecStableSort). The interface of each function is consistent with std::sort.