Add title for dev deps section and link for git-hooks section in README.md
Add title for dev deps section and link for git-hooks section in README.md

denodster/viewer.js,vdclouis/viewer.js,denodster/viewer.js,box/viewer.js,lakenen/viewer.js,lakenen/viewer.js,box/viewer.js,vdclouis/viewer.js,vdclouis/viewer.js,lakenen/viewer.js,denodster/viewer.js,box/viewer.js