Bump to 4.3.0

[ocefpaf]

netcdf-cxx4 v4.3.0 released May 13, 2016

• Fixed an issue where the tests were failing silently, and the underlying NcType class could not properly determine the type name or type size reliably. [GitHub issue Use MPI compilers for MPI builds #30](See NetCDF-CXX4 Fails a Unit Test Unidata/netcdf-cxx4#30) for more information.
• Changed NCXX_ENABLE_DOXYGEN option to an easier-to-remember ENABLE_DOXYGEN.
• Added --enable-doxygen, -DNCXX_ENABLE_DOXYGEN=ON options to allow generation of netCDF-CXX4 documentation via doxygen using either configure or cmake, respectively.
• Added netcdf-cxx4 to the Coverity Scan Dashboard.
• Added open and close methods for NcFile. See Github Pull Request #18 for more information.
• Added netcdf-cxx4 to travis-ci.org. See https://travis-ci.org/Unidata/netcdf-cxx4 for more details.
• Added NcCompoundType methods getMemberName and getMemberIndex. See Pull Request #19 for more details.
• Added cmake support to netcdf-cxx4, which will allow us to create a CDash continuous integration dashboard similar to those created for the netcdf-c and netcdf-fortran projects.
• Added a travis-ci configuration file, .travis.yml.
• Created RELEASE_NOTES.md.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[ocefpaf]

@kmuehlbauer can you take a quick look and merge?

[kmuehlbauer]

LGTM.