[REM] travis_run_flake8 from .travis.yml
[FIX] Avoided E501 errors getting after running flake8
[FIX] .travis to exclude invoice_validation_wkfl because it breaks a couple of tests
[ADD] unit test
Merge pull request #16 from tafaRU/fix_run_flake8

[FIX] errors got after running flake8
Merge pull request #18 from eLBati/fix_travis_invoice_validation_wkfl_7

[7.0] [FIX] .travis to exclude invoice_validation_wkfl
fix a badge image
Merge pull request #21 from arthru/7.0_fix_badges

[FIX] badge image
Merge remote-tracking branch 'origin/7.0' into add_account_invoice_uos_7