Remove btc

Closes #118

See merge request lqdn-interne/don!140

Fix adress in faq

See merge request lqdn-interne/don!138

Met à jour le cumul et le total quand un don est ajouté depuis l'interface d'amin

See merge request lqdn-interne/don!134

Bring up

See merge request lqdn-interne/don!129

# Conflicts:
#   README.md

We have a lot of identifiers with size>20 after 2019-04.

In case we have to process CSVs with more than 1000 rows.

b92f0d08 added default values to pass
strict SQL mode, but migrations were missing.

Had to use raw SQL queries because phinx does not support our structure.

Based on vendor/ directory currently used in production.

# Conflicts:
#   app/view/campaign/faq.html