* Switch SHLIB_OPENMP_CFLAGS to SHLIB_OPENMP_CXXFLAGS.

To fix:

Check: use of SHLIB_OPENMP_*FLAGS in Makefiles
Result: NOTE
     src/Makevars: SHLIB_OPENMP_CFLAGS is included in PKG_CFLAGS without any C files
     src/Makevars: SHLIB_OPENMP_CFLAGS is included in PKG_LIBS but linking is by C++
     src/Makevars.win: SHLIB_OPENMP_CFLAGS is included in PKG_CFLAGS without any C files
     src/Makevars.win: SHLIB_OPENMP_CFLAGS is included in PKG_LIBS but linking is by C++
    Use of these macros is discussed in sect 1.2.1.1 of ‘Writing R
    Extensions’. The macros for different languages may differ so the
    matching macro must be used in PKG_CXXFLAGS (etc) and match that used
    in PKG_LIBS (except for Fortran: see the manual).

* Add newline at end of file

To fix:

Check: line endings in C/C++/Fortran sources/headers
Result: NOTE
    Found the following sources/headers not terminated with a newline:
     inst/include/vandercorput.h
    Some compilers warn on such files.

* Whoops forgot to use PKG_CXXFLAGS in place of PKG_CFLAGS.

* Add UTF-8 encoding for roxygen2

* Add a news entry

* Update CRAN check comments

* Increase travis' speed by using 2 cores for packages.