more cleanup and reorganization

examples/simple/Decoder.java

examples/simple/Encoder.java

examples/simple/README

examples/simple/compile.sh

examples/simple/datagram/README

examples/simple/datagram/thr_compile.sh

examples/simple/datagram/thr_example.c

examples/simple/datagram/udp_compile.sh

examples/simple/datagram/udp_decoder.c

examples/simple/datagram/udp_encoder.c

examples/simple/example_decoder.c

examples/simple/example_encoder.c

examples/simple/run.sh

examples/simple/simple.lc

examples/simple/thr_decoder.c

examples/simple/thr_encoder.c

examples/simple_java/thr_compile.sh

examples/simple_java/udp_compile.sh

lib/c/Makefile

lib/c/README