build Release configuration and fix compiler versions

[gfardell]

Sets the correct compiler and toolkit to be used by the build.

Builds the shared library as 'RelWithDebInfo'. Previous build was defaulting to Debug as DCMAKE_BUILD_TYPE is not used by MSVC.

closes #211

[casperdcl]

I think you may have to use CRLF line endings since it's a batch file.

[gfardell]

I think you may have to use CRLF line endings since it's a batch file.

odd... I edited and pushed from windows

[gfardell]

PS C:\Users\[USER]\GitHub\CCPi-Regularisation-Toolkit\recipe> git ls-files --eol
i/crlf  w/crlf  attr/                   bld.bat
i/lf    w/crlf  attr/                   build.sh
i/lf    w/crlf  attr/                   conda_build_config.yaml
i/lf    w/crlf  attr/                   meta.yaml

[casperdcl]

that's only after my latest commit :)