Pass tests in es5 test262 ch15.2.3.3 (except for URI-related features)

- Add every builtin function templates in es5
- Modification on Makefile target "check" should not trigger rebuild
- Add JSON object
- Implement some toString functions
- Initialize m_value properly in ObjectPropertyDescriptor constructor

src/runtime/ErrorObject.cpp

@@ -3,6 +3,7 @@
 #include "Context.h"
 
 namespace Escargot {
+const char* errorMessage_NotImplemented = "Not implemented";
 const char* errorMessage_IsNotDefined = "%s is not defined";
 const char* errorMessage_DefineProperty_Default = "Cannot define property '%s'";
 const char* errorMessage_DefineProperty_LengthNotWritable = "Cannot modify property '%s': 'length' is not writable";