Fix nested functions. Fixes #26

Author: Alex Louden

Terraform.YAML-tmLanguage

@@ -112,7 +112,7 @@ repository:
     endCaptures:
       '1': {name: keyword.other.section.end.terraform}
     patterns:
-    - include: '$self'
+    - include: '#string_interpolation_functions'
     - include: '#string_interpolation_keywords'
 
   string_interpolation_keywords:

Terraform.tmLanguage

@@ -358,7 +358,7 @@
 			<array>
 				<dict>
 					<key>include</key>
-					<string>$self</string>
+					<string>#string_interpolation_functions</string>
 				</dict>
 				<dict>
 					<key>include</key>