Merge pull request #1006 from munkhoff/add-slickedit-gitignore

Add Global/SlickEdit.gitignore template

Global/SlickEdit.gitignore

+# SlickEdit workspace and project files are ignored by default because
+# typically they are considered to be developer-specific and not part of a
+# project.
+*.vpw
+*.vpj
+
+# SlickEdit workspace history and tag files always contain user-specific
+# data so they should not be stored in a repository.
+*.vpwhistu
+*.vpwhist
+*.vtg
+