Add jsoncpp library into project -- replacement for json_spirit -- yay!

* I was not able to successfully get the project linked into nomlib as a
static or dynamic library on OS X, so inclusion directly was a necessary
evil. Oh well! :D

* Add json/FileReader & json/FileWriter source & header files back in
with the necessary refactoring to support jsoncpp
Introduce new examples json_reader & json_writer

  - Renames
    * reader.cpp -> json_reader.cpp
    * writer.cpp -> json_writer.cpp

  * Correct ex1_good.json to be valid JSON; oops! :)
  * Right now, json_writer.cpp is more of an example of using jsoncpp
than it is nomJSON -- but that's OK -- it will suffice until the
remaining support classes are rewritten.
Remove font example -- goodbye cruel world!

* This was forgotten about; this was a part of the nom::Text class and
should have been removed along with it.
Fix header file inclusion for nomlib/gui/*

* This bug effected only the inclusion of the header files
under the IDE project view.