add namespace to deque & bug fix

- setHandleException should return reference to AppleMIDISession
- namespace around deque,

Author: lathoub

src/AppleMIDI.h

@@ -72,7 +72,7 @@ class AppleMIDISession
         return *this;
     }
 #ifdef USE_EXT_CALLBACKS
-    void setHandleException(void (*fptr)(const ssrc_t &, const Exception &, const int32_t value))
+    AppleMIDISession &setHandleException(void (*fptr)(const ssrc_t &, const Exception &, const int32_t value))
     {
         _exceptionCallback = fptr;
         return *this;

src/utility/Deque.h

@@ -1,5 +1,7 @@
 #pragma once
 
+BEGIN_APPLEMIDI_NAMESPACE
+
 template<typename T, size_t Size>
 class Deque {
 //    class iterator;
@@ -209,3 +211,5 @@ void Deque<T, Size>::clear()
   _tail = -1;
   _head = 0;
 }
+
+END_APPLEMIDI_NAMESPACE