Update usbhid-dump repo URL

Set usbhid-dump submodule URL to point to the new home on github.com.

NOTE: Run "git submodule sync" to update remote URL in the cloned
      submodule repo.
Update usbhid-dump to v1.4

Update usbhid-dump to v1.4 release, bringing mostly bug fixes.

Among the changes are:

* Request report descriptor with size specified in the interface descriptor
  to fix retrieval with some devices (e.g. Waltop Vega Tablet) which
  would produce ERROR_PIPE otherwise.
* Add missing stdint.h includes to fix Gentoo/FreeBSD build issues.
* Add README.md
Merge pull request #27 from DIGImend/usbhid-dump-update

Usbhid-dump update