FOSUserBundle twig layout amend

Remove pointless linebreak
Add package.json and bower.json

- npm will bring in uglify-js + uglifycss
- bower will bring in bootstrap + jquery
- Add package management export paths to .gitignore
Add assetic filters

Ensure all javascript and css is minified in a
production environment
Update base template

- More closely reflect the bootstrap templates
- Bring in vendor assets
README.md update

- Add "installation" section
- Add "additions" section
- Remove "Deletions/modifications from upstream" section
Merge branch 'bootstrap' into develop