Add instructions about build script to README

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>
Merge pull request #126 from nathanleclaire/readme

Add instructions about build script to README
started on integration tests

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>
test optimization; streamlined test suite for multiple drivers
allow filtering driver integration tests

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>
added helper script for running tests in docker

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>
update travis to skip integration tests

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>