[#160] Correction to Project.amount_needed_to_fully_fund_via_paypal()

Fix the method that calculates how much a project needs to be fully
funded when donating via PayPal
Changing permissions on git_hooks/pre-commit to 744
Merge branch 'develop' of github.com:akvo/akvo-rsr into develop
[#162] Fix update form in RSR

Add the language field to the project update form in rsr,
templates/rsr/project/update_form.html, that was recently added in the
ProjectUpdate model.

Add help text to the language field in both forms

Add dev domain in partner sites middleware