Flint 1.0.0 Release Candidate 3

 - [x] Remove Facebook script and replace with steel function `steel_open`
 - [x] Add Bootstrap files
 - [x] Add Font Awesome files
 - [x] Remove CDN links and replace with links to native files for Bootstrap
 - [x] Remove CDN links and replace with links to native files for Font Awesome
 - [x] Add download button and functions `has_download_btn` and `the_download_button`
 - [x] Line up `.entry-title` with rest of elements (i.e. featured image, download button, edit button, etc.)