use the wing perl

Make sure the newly-installed perl is used so that prerequisite
modules are found.
typo in documentation

"MyProject" must have been a typo for MyApp. I can't find reference to
MyProject anywhere else, and this change makes sense.
small documentation improvement

Makes it more clear what wing_init_app.pl does to help the user find
their new code.
Merge branch 'master' of https://github.com/amoore/Wing into amoore-master

Conflicts:
	README.txt