Resolve "protocol : add DocumentHasher Trait"

Closes #46 (closed)

documents/blockchain/v10/documents/identity.rs

@@ -195,6 +195,13 @@ impl StandardTextDocumentParser for IdentityDocumentParser {
     }
 }
 
+/*impl DocumentHasher<A, IdentityDocument> for IdentityDocument
+    where A : HashAlgorithm {
+    fn hash_str(algo: A, document: IdentityDocument) -> String {
+        algo.hash_str(document.as_text())
+    }
+}*/
+
 #[cfg(test)]
 mod tests {
     use super::*;