removed salary_rule record because it makes hr_payroll_account test fail
Reactivate UNIT_TEST
Addedintall wkhtmltopdf in .travis.yml because it is a depedency for module account_financial_report_webkit
Changed version of wkhtmltopdf to install on travis
[IMP] Display form view
[FIX] Typo
Merge pull request #27 from savoirfairelinux/7.0-ddufresne-income_tax_deductions

[ADD] Income tax deductions
Merge pull request #28 from savoirfairelinux/7.0-ddufresne-fix_salary_rules

[IMP] Remove salary_rule record because it makes hr_payroll_account test fail
Merge pull request #30 from savoirfairelinux/7.0-display-expense-form-view

[IMP] Display expense line form view
added tests
Put the field estimated_income field in the deduction_category model instead of employee_deduction. Added test for the sum_deductions method. Corrected errors in translation files.
income tax deductions improvement
deductions
fixed pylint error
Merge branch '7.0-ddufresne-income_tax_deductions' into 7.0-ddufresne-employer-contributions
deductions
Added the possibility to sum over multiple deduction codes
Merge branch '7.0-ddufresne-income_tax_deductions' into 7.0-ddufresne-employer-contributions
Test payroll structure