Eclipse project reworked

1. Moved into a folder in platforms. This way, different Eclipse projects can be created per platform. This one is for Windows/Cygwin.
2. Utilizes Eclipse C/C++ Unit test plugin. You can re-run selected tests, etc. like with JUnit.
3. Build artifacts are put into cpputest_build folder.
4. Before using the Eclipse project, you should
    - cd cpputest_build
    - autoreconf .. -i  #if necessary
    - ../configure
Works on my home and work machines, so I hope it will work for others.