lists:member is missing

[aberman]

1. Open an erlang file
2. Type 'lists:mem' or just type 'lists' and search for member

Actual result: lists:member does not exist in the completion drop down
Expected: lists:member should be included in the completion drop down

[aberman]

lists:keyfind is missing as well

[Roberto Ostinelli]

The missing functions were BIFS, hence the parser was not able to find them.

[aberman]

Awesome!