Made search working and placed search icon [Fixes #355]

[cjchirag7]

Closes #355

I have made the following changes

• Improved the implementation of search, so that it works perfectly and pagination is also taken care
• Changed the search placeholder, to include a search icon

A screencast of the working -

[birm]

It looks like the search and pagination don't work when stacktables is active (very narrow/mobile sized screen). I think it's ok to resolve this by either fixing the search for this case, or by not displaying the searchbar on small screens.

[cjchirag7]

@birm , it is not even working on my desktop. I have tested it for both Chrome and Firefox in my desktop, as described in the issue #355

[birm]

Ok, we can merge this as a bugfix for that case. Thanks for the work!