Merge branch 'yparser' into 'master'

Knot.files

scripts/update-parser.sh

src/Makefile.am

src/libknot/errcode.c

src/libknot/errcode.h

src/libknot/internal/yparser/yparser.c

src/libknot/internal/yparser/yparser.h

src/libknot/internal/yparser/ypbody.c

src/libknot/internal/yparser/ypbody.rl

src/libknot/internal/yparser/ypformat.c

src/libknot/internal/yparser/ypformat.h

src/libknot/internal/yparser/ypscheme.c

src/libknot/internal/yparser/ypscheme.h

src/libknot/internal/yparser/yptrafo.c

src/libknot/internal/yparser/yptrafo.h

tests/.gitignore

tests/Makefile.am

tests/yparser.c

tests/ypscheme.c

tests/yptrafo.c