Fixed few memory leaks

[miktam]

Fixed few memory leaks mentioned here:
#40

[flyth]

Thanks for those fixes! One problem, though:
VALUE_TYPE_BLOB and OutParam::OCCIBLOB actually get freed by a callback that is passed to node (see "RandomBytesFree") and shouldn't be freed manually - otherwise you might get weird stuff written to that memory :)

[flyth]

I tested a little further and still got a pretty huge amount of memory "leaking". However:
If I add a new scope like

void Connection::EIO_AfterExecute(uv_work_t* req, int status) {
    HandleScope scope;

to that EIO_AfterExecute, all memory is getting freed. I'm still at the beginning of getting to know how this all works, but as it seems the scope that was used before was that of the connection (rather than the execute)...

I guess I'll have to read a little further...

[miktam]

flyth, thank you for your valuable input, I addressed it in a last pull request.
HandleScope is exactly what we need here: http://bespin.cz/~ondras/html/classv8_1_1HandleScope.html

[miktam]

Closed, as it is fixed here: #45