Added netCDF Python, fixed C++ URL.
Merge branch 'master' of https://github.com/Unidata/netcdf-c
Updating cmake shared_linker_flags as suggested by Nico Schlomer: https://github.com/Unidata/netcdf-c/issues/46

Fixed indentation.

Updated .gitignore.

Added a macro to make it easy to check to see if the linker supports a particular flag.  Debug builds now pass the -w1,--no-undefined if it is detected the linker supports it.
Corrected an issue with disabling the V2 API support in cmake-based builds.
Added autoconf to software which is provisioned.
 Merge branch 'vagrant-dev' of https://github.com/Unidata/netcdf-c into vagrant-dev