Merge branch 'master' into luajit

.travis.yml

SConstruct

appveyor.yml

examples/SConscript

examples/grammar.c

examples/grammar.h

examples/ties.c

src/SConscript

src/allocator.c

src/backends/contextfree.h

src/backends/lalr.c

src/backends/llk.c

src/backends/lr.c

src/backends/lr.h

src/backends/lr0.c

src/backends/packrat.c

src/backends/regex.c

src/backends/regex.h

src/backends/regex_debug.c

src/benchmark.c