Replace all instances of auto_ptr with unique_ptr.

Make EmberRender and EmberAnimate place their output renders in the same folder of the input parameter file. Previously it was just placing them in the same folder as the executable, which is wrong.

Source/Ember/Utils.h

@@ -815,6 +815,24 @@ static string Trim(const string& str, char ch = ' ')
 	return ret;
 }
 
+/// <summary>
+/// Return a copy of a file path string with the path portion removed.
+/// </summary>
+/// <param name="filename">The string to retrieve the path from</param>
+/// <returns>The path portion of the string</returns>
+static string GetPath(const string& filename)
+{
+	string s;
+	const size_t lastSlash = filename.find_last_of("\\/");
+	
+	if (std::string::npos != lastSlash)
+		s = filename.substr(0, lastSlash + 1);
+	else
+		s = "";
+
+	return s;
+}
+
 /// <summary>
 /// Placeholder for a templated function to query the value of a specified system environment variable
 /// of a specific type. This function does nothing as the functions for specific types implement the behavior