Revert "Application detection should also allow dots in the path."

Ruby 1.9 regression.

This reverts commit 76237f1.

railties/lib/rails/engine.rb

@@ -17,7 +17,7 @@ def inherited(base)
           base.called_from = begin
             # Remove the line number from backtraces making sure we don't leave anything behind
             call_stack = caller.map { |p| p.split(':')[0..-2].join(':') }
-            File.dirname(call_stack.detect { |p| p !~ %r[railties[\w\-\.]*/lib/rails|rack[\w\-\.]*/lib/rack] })
+            File.dirname(call_stack.detect { |p| p !~ %r[railties[\w\-]*/lib/rails|rack[\w\-]*/lib/rack] })
           end
         end