Highlight modules, records, protocols, impls as types

This is pretty much a copy of
<https://github.com/secondplanet/elixir-mode/commit/878e52f70f13e7476c66b50745039791ada59ec1>,
with the exception that this catches more types of
interfaces/types. Thanks to @carlosmn for the work (-:

Author: antifuchs

elixir-mode.el

@@ -223,6 +223,9 @@
    ;; comments:
    '("#.*$" . font-lock-comment-face)
 
+   ;; records and modules at point of definition:
+   '("^\\s *def\\(module\\|record\\|protocol\\|impl\\)\\s +\\([^( \t\n,]+\\)" 2 font-lock-type-face)
+
    ;; methods:
    `(,(concat "^\\s *\\<" (regexp-opt elixir-mode-define-names t) "\\>\\s +\\([^( \t\n]+\\)") 2 font-lock-function-name-face)