js/lifelog.js: allow users to filter by tag
main: use angular to output tag html and not javascript
main.html: use div and not span for panels
index.html: make footer columns a fourth of the grid
js/lifelog.js: reformat to make code read a bit easier
main.html: use four columns across the grid
main.html: reword the did you know section
main.html: fix placeholder so it doesnt overflow