add POST /feedback
add feedback form
fix process.env
fix crash if no mail settings
fi trailling console.log
fix request and add optional username
Merge branch 'feedback' of https://github.com/ezpaarse-project/ezpaarse into feedback
fix param json instead of body
add main instance url in config
replace MAIN_INSTANCE by PARENT_URL
admin mail is used as sender for feedbacks
adjust mail options
fix crash on request error
Merge branch 'feedback'