Remove unneeded file

src/parse/relation.rs

@@ -1,25 +0,0 @@
-struct RelationArg<'a, T> {
-    args: Vec<T>,
-    value: Option<&'a [u8]>,
-    modifier: RelationModifier
-}
-
-enum RelationModifier {
-    All,
-    Any,
-    None
-}
-
-enum RelationKind<'a, T> {
-    Present(RelationArg<'a, T>),
-    NotPresent(RelationArg<'a, T>),
-    None
-}
-
-struct Relations<'a, T>(Vec<RelationKind<'a, T>>);
-
-impl<'a, T> Relation<'a, T> where T: Eq {
-    fn is_sat(&self, &[T]) -> bool {
-        for r in self.
-    }
-}