Incorrect parsing of tokens

Recently I came across a module which uses a ":" in it's token key name, "user:profile_my_field_name", which when combined with the token category, became "user:user:profile_my_field_name". Now I think that module (token_profile) is probably wrong, but I reckon ctools module should be able to handle it a bit better.

Currently "user:user:profile_my_field_name" is treated as "user:user" by the ctools module which causes the user's username to be printed out rather than the desired profile field. The attached patch fixes this.