update travis config

use UNIT_TEST rather than maintain complex include/exclude rules
fix copy paste error
remove .coveragerc
Merge pull request #69 from gurneyalex/7.0-update-travis

update travis config
[FIX] pylint relative imports
[FIX] pylint redefined-outer-name
[FIX] pylint W0105(pointless-string-statement)
[FIX] pylint regexp raw string
Merge pull request #81 from acsone/7.0-pylint-sbi

7.0 pylint
[FIX] account_move_validation_improvement: order by date
Merge pull request #80 from sbidoul/patch-1

[FIX] account_move_validation_improvement: order by date
Forward port '7.0' into 8.0 until 3d9552aa
Merge pull request #84 from acsone/8.0-forward-port-sbi

Forward port '7.0' into 8.0 until 3d9552a