add thumbnail provider
add thumbnail provider
Merge pull request #1288 from rossriley/thumbnail-service

Thumbnail service
change thumbs to use semantic versining, matching main bolt package
Merge pull request #1290 from rossriley/thumbs-semantic-versioning

change thumbs to use semantic versining, matching main bolt package
Tweaking composer.json for bolt/thumbs.
move the location of the cache directory to inside app directory as expected by default Bolt App
Merge pull request #1291 from rossriley/fix-cache-location-tests

move the location of the cache directory to inside app directory