Updated UI with Bootstrap

Integrated bootstrap into the application. Currently the integration is quite
minimalistic. Only grids and buttons are added. Propper itegrations with forms
is also not there.
Updated the design of Blog Home Page.

Updated the Blog Home Page design. Added a bootstrap jumbotron which shows the
intention of the project and provides a link to the github page of the project.
Updations in base.html template is also made. Footer is now more prominent.
Styled User Authentication pages.

Added template inheritance in user_app templates and integrated bootsrap into
these too. Currently the login and signup forms are held within a panel but
something better needs to be thought of.
Merge branch 'bootstrap' into develop. Updated UI using Bootstrap.

UI of the project has been updated with bootstrap. The UI is intended to be
simplistic. The project is still in its prototype phase and there are many
UX related issues which need to be addressed.