Bug fixes, refactoring

Bug fixes:

• Edited comments not emailed, fixed
• Filtering comments and history on time stamp not working, fixed
• Epics have no owning team. Features, user stories and tasks have
• "This backlog item is realized by team 'null'" in setStateEvent, fixed

Refactoring

• Combine filtering code for detail and overview to one common file
• Change BCard border color to blue