Updating documentation regarding building on OSX. Adding Eclipse projects for Libraries and Workspace. Updating Eclipse project so the same pre-processor defines are used as in the makefile.  Updating the project to include linked folders so that include files are resolved correctly.

At this point the project does not build on OSX, it complains about unresolved references to TwoWire and Wire which is odd because they are included by the Makefile.  Some investigation required.