modified Gemfile
add a
del a
add client side validation feature
add mail notification
fix small css problem
change db back to postgres
change Gemfile
change Gemfile
Update README.md

add system overview diagram
add development process diagramm
Merge branch 'master' of https://github.com/pkwiecien/tumitfahrer
Update README.md

add development process diagram and update roadmap
Update README.md
Update README.md
Merge branch 'master' into web_dev
Merge branch 'web_dev'
Merge branch 'master' of https://github.com/pkwiecien/tumitfahrer
merge validation of user input into develop
Notification schema