updated changelog

fixed changelog typo

fixed trait name in docs

Merge branch 'master' of https://github.com/plank/laravel-mediable

Fix Media::scopeForPathOnDisk not working when directory name is empt…

…y. (plank#39)

Fix typo in MediaUploader

Applied fixes from StyleCI (plank#37)

corrected doc markup

added contributing.md, upgrading.md, updated changelog

updated changelog