Adds New Post and Edit Post buttons to templates

modified:   blog/assets/css/main.css
modified:   blog/assets/css/main.sass
new file:   blog/assets/img/fb_icons.png
modified:   blog/templates/base.html
modified:   blog/templates/create.html
modified:   blog/templates/details.html
modified:   blog/templates/edit.html
modified:   blog/templates/index.html
modified:   app.yaml