Merge pull request #5 from mindplay-dk/error-summary

add basic error-summary renderer

add support for `<input type="datetime-local">`, per #4

Merge pull request #3 from boan2010/patch-1

corrected language constant name

Merge pull request #1 from PhlegmaticGuy/master

Bugfix - cant set min or max to 0 on numeric fields

renderer defaults to an id-prefix of "form" (because e.g. radio/check…

…box groups aren't possible without an id)

upgrade mindplay/lang and following Composer convention

add code coverage icon