Fix region highlighting and skipping

Ref #8

syntax_files/python2.yaml

@@ -42,12 +42,14 @@ rules:
     - constant.string:
         start: "\""
         end: "\""
+        skip: "\\\\."
         rules:
             - constant.specialChar: "\\\\."
 
     - constant.string:
         start: "'"
         end: "'"
+        skip: "\\\\."
         rules:
             - constant.specialChar: "\\\\."
 
@@ -55,3 +57,4 @@ rules:
         start: "#"
         end: "$"
         rules: []
+