Remove bunch of js lines in rails

[Prakriti-nith]

This PR aims to remove a bunch of lines that occur in the head tag in rails. Dependent JS and CSS files are shifted to vendor/assets/javascripts and vendor/assets/stylesheets respectively. JS can be included in the app/assets/javascripts/application.js file as:

//= require jquery-latest.min
//= require jquery.dataTables

CSS files can be included as:

 *= require jquery.dataTables

and include the below lines in the head of the layout file:

<%= javascript_include_tag "application" %>
<%= stylesheet_link_tag "application" %>

Note: The previous method to use <%=raw Daru::DataTables.init_script %> will also work.

[coveralls]

Pull Request Test Coverage Report for Build 21

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 17:	0.0%
Covered Lines:	233
Relevant Lines:	233

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💛 - Coveralls

[Shekharrajak]

Examples for these changes has to be done.

[Prakriti-nith]

Refer commit for examples in dummy_rails.