Add 5.5.1
Merge branch 'master' into feature/5.5.1

Conflicts:
	.travis.yml
	run-tests.sh
Merge pull request #138 from CHH/feature/5.5.1

Add 5.5.1
supporting CONFIGURE_OPTS environment variable
Merge pull request #139 from classmarkets/CONFIGURE_OPTS

supporting CONFIGURE_OPTS environment variable