Making the Endian enumeration follow the standard of CamelCase names.

src/endian.rs

@@ -40,15 +40,15 @@ pub enum LittleEndian
 pub enum Endianess
 {
    /// Referes to BigEndian.
-   BIG,
+   Big,
 
    /// Referes to LittleEndian.
-   LITTLE,
+   Little,
 
    /// Referes to PlatformEndian. This can be anyone
    /// of the other available endians depending on
    /// the platform you are on.
-   PLATFORM
+   Platform
 }