Merge branch 'voidtest'

compiler/CS_CodeGen.jrag

compiler/C_CodeGen.jrag

compiler/DeclNames.jrag

compiler/ErrorCheck.jrag

compiler/Java_CodeGen.jrag

compiler/LabComm.ast

compiler/LabComm.java

compiler/LabCommParser.parser

compiler/TypeCheck.jrag

examples/simple/Decoder.java

examples/simple/example_encoder.c

examples/simple/simple.lc

examples/twoway/client.c

lib/c/test/test_labcomm_generated_encoding.c

test/Makefile

test/errors/correct/structtype.lc

test/errors/correct/void.lc

test/errors/incorrect/void.lc

test/relay_gen_c.py

test/relay_gen_cs.py