adding new-json protocol code

adding new-json protocol code
added in new build config var OSRF_LEGACY_JSON, which, when set, tells the compiler to build the JSON code as a standlone .so called libobjson.so for legacy support
this flag also copies the objson headers into place.  the objson headers are how just dummy wrappers around the osrf_json headers.
added jsonObjectIterator/jsonObjectNode legacy code

git-svn-id: svn://svn.open-ils.org/OpenSRF/branches/new-json2@1007 9efc2488-bf62-4759-914b-345cdb29e865