update travis config

use UNIT_TEST rather than maintain complex include/exclude rules
fix travis config

we need to use the master branch of maintainer-quality-tools to use UNIT_TEST
fix copy paste error
remove .coveragerc
Merge pull request #68 from gurneyalex/8.0-update-travis

update travis config
Merge branch '8.0' of https://github.com/OCA/account-financial-tools into 8.0