Integrated Perfect Scrollbar into notifications dropdown
changes hovercard background color to grey on hover
Merge branch 'release/0.4.1.0' into develop
Merge pull request #5129 from jaideng123/5106-scrolling_in_notifications

Increased the number of notifications shown in drop down bar to 15

Conflicts:
	Gemfile.lock
Fix loading issues in rails_admin

Properly declare Admin module and explicitly list models to be
display in rails_admin