Added Dropdown Menu

[angeryrohan]

Contribution

Fixing Issue: #499

Integrated a Drop-Down Menu into Bassa, with animations and interactive icons. Brought the UI back into the responsiveness in which it was before after doing all of my changes in the repository.
+ Added dynamic working of buttons through angular expressions

Description

I analyzed all the files, inspected and triggered important stuff that had to be changed in order to get a unique Drop-down Menu containing the three following features:

1.File Size
2.Date Of Download
3.Remove with confirmation (User-input: Yes or No)

Here is the updated preview

Task Uploaded On: http://itsrohan.com/gci/gcitasks

[angeryrohan]

Thanks for the review, I'll fix this as soon as possible

[angeryrohan]

@vivonk I've made the required changes...