Disable regression test and turn on test-framework

The regression test has been disabled because it seems to allocate way
too much memory to be useful for CI purposes.

Moreover, the other two test-suites have been changed to be build using
test-framework which should have more well-behaved logging output
suitable for Travis-CI
Use --show-details=streaming when available

Travis-CI assumes the build to be stuck if there's no output for several
minutes. Which is a problem since the tests for bytestring take quite
long.