Made the footer links dynamic

* Added the jinja logic to render footer links
Merge pull request #9 from rahulsukla/develop

Made the footer links dynamic
Merge pull request #12 from rahulsukla/develop

Added enbblock statement for better readablity
Import missing macro on category
Merge pull request #13 from rahulsukla/develop

added block base_stylesheet in base.jinja which lets you choose/skip the base stylesheet and removed app.js from default requirement and placed it into extra script.
Merge pull request #14 from rahulsukla/develop

fixed _helper import issue in category page
Merge pull request #15 from rahulsukla/develop

fixed the product sale price function in _helpers.jinja
Merge pull request #16 from rahulsukla/develop

added an placeholder image
Add nereid-checkout as a dependency
fixed script import in category page
Added flash message feature in Templates

* Added notify plugin and script to pick flash messages