Further improvements to 2012/blakely/try.sh

The script now has quotes surrounding commands with '*'s in it and the
messages (of which some were added - only one existed before) were
improved when it comes to giving a warning that the next command might
take a bit of time. There are different messages depending on how slow
the commands are though this obviously cannot be even close to perfect.

Updated .gitignore.

2012/blakely/.gitignore

@@ -3,14 +3,8 @@
 blakely
 blakely.orig
 *.dSYM
-empty.gif
-flat.gif
+*.gif
 indent
 indent.c
 indent.o
-output.gif
-paraboloid.gif
-pic.gif
 prog.orig
-ripple.gif
-saddle.gif