Move v8 up to 75e8e69531240599fccb73656c3d12467740a94e (tag 3.24.4)
Update to work with current v8 build setup
Add convenience function for constructing v8::String objects
Update to compile with the current v8 API

Straightforward call site changes, mainly adding an extra Isolate*
argument + some changes to method names (templates are now Reset()
rather than Dispose()d.)

Make use of new base::String::New() so as to make creation of v8
string locals not too bulky.
Make CompileFile() be context independent

Compile the script independent of the current context. Not that there
are known downsides from using the context-dependent Compile() instead
New(), but it seems preferable overall to do so.
Change the positioning and use of Handle scopes

The v8 HandleScopes are now less forgiving when returning handles that
go out of the (handle) scope they were created in. You now have to
explicitly copy out such handles via EscapableHandleScope objects.

To make it all work, HandleScopes had to be moved off Runtime::Select
objects also. Instead requiring a handle scope to be set up when
needed for when a Runtime::Select context is entered.

Setting up HandleScopes for Function::Call() is also problematic, as
we do want its result to outlive the invocation. Remove it. (This also
addresses the debug asserts that have been triggering for a while.)
Don't delete module instance from GlobalObject::Instance::~Instance()

The GlobalObject class is a sort of global object proxy object returned
by the 'global' property on module objects, typically referenced from
other modules.  These "global objects" don't own the module object whose
global scope they proxy, and even if they did, they wouldn't need to
delete the module instance objects explicitly since they are garbage
collected objects.
Add system libraries after v8 libraries on linker command line

Unsure why, but having -lrt before -l$(v8) no longer works on
Ubuntu 12.10.  However, since it is v8 that depends on librt
(and also on libpthread) it makes sense to specify the libraries
in this order on the command line.