Downgrading jQuery & upgrading dependencies

- Downgrading jQuery to v1.11.1 in order to support older versions of IE
- Upgraded bootstrap v3.2.0 › v3.3.1
- Ugraded dropzone v3.10.2 › v3.11.1
- jquery.scrollTo v1.4.13 › v1.4.14
- select2 v3.5.0  › v3.5.2
- social-likes v3.0.4 › v3.0.9