fix(cmn): serde cleanup;JsonError pub fields

Author: Byron

Cargo.toml

@@ -18,8 +18,9 @@ path = "src/rust/lib.rs"
 [dependencies]
 hyper = "*"
 mime = "*"
-rustc-serialize = "*"
 yup-oauth2 = "*"
+serde = "*"
+serde_macros = "*"
 
 [dev-dependencies]
 yup-hyper-mock = "*"

src/rust/cmn.rs

@@ -45,8 +45,8 @@ impl<T: Seek + Read> ReadSeek for T {}
 /// A utility type which can decode a server response that indicates error
 #[derive(Deserialize)]
 pub struct JsonServerError {
-    error: String,
-    error_description: Option<String>
+    pub error: String,
+    pub error_description: Option<String>
 }