Update README.md
added missing </div> in default show template
Merge pull request #329 from drewnichols/patch-2

fixed description of custom templates in the README.md
Merge pull request #330 from drewnichols/patch-3

added missing </div> in default show template
Issue-273 -- adds table settings to toggle display of columns
Merge branch 'issue-273-remake' of github.com:frozenflower/ember-cli-admin into issue-273-remake