Check in modified versions of SWIG and IMake. This is the what's currently in the node SVN sandbox branch.

See http://trac.osgeo.org/mapguide/log/sandbox/jng/node for the history of modifications that we're checking in here.
Add node extension project.
- Add required files and templates for SWIG wrapper generation.
- Parameterize linker paths in extension project
- Add Jakefile containing our build targets.
- Add batch file to run swig to generate C++ source. This was supposed to be a build task in Jake, but paths get screwed up for reasons unknown to me.
- Add static snapshot of njake (https://github.com/prabirshrestha/njake), needed for msbuild integration in Jake.
README.md and ignore list update
ignore list update