Implemented support to modify slot return type.

Included method type in DynamicQMetaObject metadata.
Moved Signal/Slot objet to libpyside.
Create unittest to signal class.
Implemented disconnection function.
Fixed emit method on signal object

libpyside/qsignal.h

@@ -0,0 +1,29 @@
+#ifndef QSIGNAL_H
+#define QSIGNAL_H
+
+#include <pysidemacros.h>
+#include <Python.h>
+#include <QObject>
+
+namespace PySide
+{
+
+typedef struct {
+    PyObject_HEAD
+    bool initialized;
+    char *signal_name;
+    char **signatures;
+    int signatures_size;
+    PyObject *source;
+} SignalData;
+
+extern "C"
+{
+    PyAPI_DATA(PyTypeObject) PySideSignal_Type;
+    PyAPI_DATA(PyTypeObject) PySideSignalInstance_Type;
+}; //extern "C"
+
+PYSIDE_API void signal_update_source(PyObject *source);
+
+} //namespace PySide
+#endif