Add 2015/endoh3/try.sh + format/typo checks

A new make rule (or alias for mullender and back_to) called 'future' was
added for the theme. The try.sh script uses make future ('back_to' just
doesn't look that good in my eyes even when I added it).

The try.sh tries to stay in character with the award theme a bit too
though that will only be noticeable if you pay attention. I found the
films very boring (though maybe years later I would find it more
enjoyable) so I'm sure that something more fun could have been
added if I knew them more but I do not. Well I tried anyway.

2015/endoh3/Makefile

@@ -135,7 +135,7 @@ all: data ${TARGET}
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
 
-mullender back_to: ${PROG}.c mullender.c
+future mullender back_to: ${PROG}.c mullender.c
 	${CC} ${CFLAGS} $< -o ${PROG} ${LDFLAGS} ${BACK_TO}