libimagerror: Deny warnings

Signed-off-by: Gavin Thomas Claugus <gclaugus@gmail.com>

libimagerror/src/lib.rs

@@ -1,3 +1,17 @@
+#![deny(
+    non_camel_case_types,
+    non_snake_case,
+    path_statements,
+    trivial_numeric_casts,
+    unstable_features,
+    unused_allocation,
+    unused_import_braces,
+    unused_imports,
+    unused_mut,
+    unused_qualifications,
+    while_true,
+)]
+
 #[macro_use] extern crate log;
 extern crate ansi_term;