Method insert

libcppcryptfs/context/cryptcontext.h:58–62

	CryptOpenHandles() {};

	void insert(HANDLE h) 
	{
		lock_guard<mutex> lck(m_mutex);
		m_handles.insert(h);
	}
	void erase(HANDLE h)
	{
		lock_guard<mutex> lck(m_mutex);