This commit tweaks the debian packaging tool:

* All build environment metadata can now be overriden on the command
  line. This allows testing the CI build behaviour locally.
* -unstable packages now actually contain the binaries (oops)
* packages use Go 1.7 to build
* archiving is skipped for PR builds

The new build script, ci.go, replaces some of the older shell scripts.
ci.go can compile go-ethereum, run the tests, create release archives
and debian source packages.

Turns out we actually don't need it, USE_NUM_NONE works
because we also set USE_FIELD_INV_BUILTIN.

This should yield another 30-second speed up. Nobody looks
at the output of those anyway. We might want bring back gofmt later
and actually fail the build if source is not formatted.

This should decrease test runtime to about 30 seconds.

Satisfy dependency for obscuren/qml fork

Conflicts:
	libjsqrc/ethereumjs/.travis.yml
	libjsqrc/ethereumjs/README.md
	libjsqrc/ethereumjs/dist/ethereum.js
	libjsqrc/ethereumjs/dist/ethereum.js.map
	libjsqrc/ethereumjs/lib/abi.js
	libjsqrc/ethereumjs/package.json

prevent coverage results from being submitted to coveralls if when the
build fails