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/try.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2015/endoh3
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+# clear screen so that only the entry is shown
+clear
+
+read -r -n 1 -p "Press any key to run: less -EXF prog.c (space = next page, q = quit): "
+echo 1>&2
+less -EXF prog.c
+echo 1>&2
+
+echo "$ make future" 1>&2
+make future || exit 1
+
+echo 1>&2
+echo 1>&2
+
+echo "Will go back to the future and run 1984/mullender through prog. To quit" 1>&2
+echo "the program hit ctrl-c/intr." 1>&2
+echo 1>&2
+echo "You might want to try hitting enter or another key when the output reaches" 1>&2
+echo "the end of the line." 1>&2
+echo 1>&2
+read -r -n 1 -p "Press any key to continue: "
+echo 1>&2
+echo "$ ./prog" 1>&2
+./prog