[FIX] account_companyweb test suite

WIP: I still need to set a VAT number of the company
[FIX] add dependicy on account-financial-reporting in .travis.yml

Necessary because account-financial-report-webkit is a dependency of
account_companyweb.
[FIX] account_companyweb: fix tests (set vat on main company)
[FIX] more fixes to account_companyweb test suite

Was working with OCB but not official 7.0.
[FIX] add xlrd dependency in .travis.yml
Merge branch '7.0'