Makefile: Add Debug and Release targets instead of var
Makefile: Add make options list in help menu
Makefile: clean target listed in help menu
Build: Unix shared objects now build to sdk/bin/
Makefile: Added 'All' target.
README: Updating build section
Build: Examples/tests build into respective directories.
Build: All tests/examples output to sdk/bin/
Build: Fixing ld warning on OS X dynamic builds.
Merge branch 'build'