refactor DefaultController
stronger shortUrl detection
repository replaces em in UrlShrinker
extract Decorator from Shrinker
Merge branch 'refactor' into devel
redirect by shortUrl instead of id
show urls after creation
add style for url success message
Merge branch 'feature-show-url' into devel
avoid duplication with UrlRepository
add unicity to url and shortUrl
Merge branch 'feature-avoid-duplication' into devel
bump to version 1.0-alpha
Merge branch 'release-1.0-alpha'