Bump version to 2.0.4
#151 course modification
Fixes #156
#151 Select day of week from the entity value
#151 modify overlapping classes validator to exclude currently modified class from search
Add constants to store form intentions
#151 Use different list when creating and editing class
#155: always use active teachers list
Fixes #154
Remove "remember me" checkbox and change title
Fixes #150
Merge commits from 2.0.4