Part of changes from mdkent/chef-repo/cook-119:

Rakefile changes went over to chef_repo.rake in Chef proper.
Adding configuration option, TEST_CACHE

Add rake task to test templates with erubis.
Break test tasks into 2 distinct options but run both by default.
Add caching of test results with a configurable location.
Add gitignore to avoid sending these and vim swap files up.

config/rake.rb

@@ -52,3 +52,6 @@
 
 # Where to store certificates generated with ssl_cert
 CADIR = File.expand_path(File.join(TOPDIR, "certificates"))
+
+# Where to store the mtime cache for the recipe/template syntax check
+TEST_CACHE = File.expand_path(File.join(TOPDIR, ".rake_test_cache"))