display error message to invalid video urls
duplicate videos are not allowed
changing video title position
removing the "required field" msg from video field
Merge pull request #160 from it3s/videos-fixes

Videos fixes
fix the main menu on small screen
Merge pull request #161 from it3s/menu-fixes

fix the main menu on small screen
closes #163
Merge pull request #164 from it3s/remove-add-to-proj-from-projs

closes #163
closes #162
Merge pull request #165 from it3s/fix-for-issue-162

closes #162
adding cover photo
Merge pull request #166 from it3s/cover_photo

Adding cover photo to map popups
refactoring
adding layers page
building
converting tags to layer rule
improving the layers code
loading layers into widget
adding Layer model