Enhancement - Hooks

- Added Lua copyright notice to the version command.
- Added Lua copyright details to API.cpp, which is the only file that
  interacts with Lua.
- Added hook-type detection.
- Added a hook-type calling mechanism in Hooks.
- Implemented the post-start and pre-exit event triggers.
- Context::initialize now calls Hooks::initialize, which in turn calls
  API::initialize.  We have liftoff!

src/API.cpp

@@ -23,6 +23,28 @@
 //     02110-1301
 //     USA
 //
+// -------------
+//
+// Copyright © 1994–2008 Lua.org, PUC-Rio.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
 ////////////////////////////////////////////////////////////////////////////////
 
 #include "API.h"
@@ -389,7 +411,7 @@ void API::initialize ()
 {
   // Initialize Lua.
   L = lua_open ();
-  luaL_openlibs (L);
+  luaL_openlibs (L);  // TODO Error handling
 
   // Register all the API functions in Lua global space.
   lua_pushcfunction (L, api_task_version);               lua_setglobal (L, "task_version");