Removed the empty debug.core.tests project. Also removed the
utils-feature and remote-feature projects since these shouldn't
be features.
Change-Id: Ib5d297c626de5328e3421a1fc9346330d9907750
Added dependency to Gson for JSON parsing and Apache Http Client
for getting the index files from the Arduino site.
Change-Id: I3d265c1037e7f74e082f36c751f5eaf780e96684