fixed missing responsive images js
Changed the structure of the readme
update readme files
Update README.md
Update README.md
Update README.md
Update TROUBLESHOOTING.md
Update RELEASING.md
Update RELEASING.md
Update README.md
Update README.md
Update CONTRIBUTING.md
Update README.md
add available grunt commands
remove unused grunt commands
add more links into readme
add more details into testing
added history.md
added more narrative
add extra line about contributing