Update README.md
Merge branch 'master' of https://github.com/Fenykepy/phiroom
delete old some old files
Fix a bug of error500 instead of 404 when DEBUG was false, add custom error pages
Fix a bug in librairy.utils.recursive_import, add a prod_settings.py example file, complete install instructions in README.md
try to format README.md correctly
separate INSTALL.md from README.md
Improve INSTALL.md markdown (should look better)
Fix a big bug with update and delete views of posts with same slug, add a new mail management system, need to upgrade user table
Update INSTALL instructions