Made Bootstrap 3 compliant and responsive-friendly

Made changes so that classes and code are Bootstrap 3 compliant and are responsive on various devices.
Stylesheet deletions/additions

Deleted the repeated stylesheet reference to assets/css/style.css and also deleted ther reference to a bootstrap css file because we already included bootstrap as an SCSS file inside our SCSS folder, which is automatically compiled to our main style.css stylesheet.
Added .clear class

Added clear as a class for clearing floats.
SCSS compilation

SCSS compilation caused recompilation of CSS. To review specific changes, please visit the SCSS folder.