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.
fixed pylint error
Added the possibility to sum over multiple deduction codes
Fix pylint
Fixed views and added default amount type on deduction category.
Merge pull request #36 from savoirfairelinux/7.0-ddufresne-income_tax_deductions

[IMP] Canada income tax deduction