Merge tag '2.0.4' into develop

2.0.4
Allow overriding the blueprint field 'title' required parameter.
Allow overriding time field on each page edit.
Allow overriding date field on each page edit.
field variable sets autocompletion index

the variable $this->field was set but not used right?
I made this change so that the field variable defines the field indexed for the autocompletion.
usage example where the uri's of all pages are used for autocompletion:

````
related:
    label: Related pages
    type: tags
    index: all
    lower: true
    field: uri
````
Fixed another possible bug
Changed the version number
Merge branch 'mcbrwr-patch-1' into develop
Updated new entries for Kirby 2.0.4
Added the Finnish translation by Ilja
Update for the Czech translation
Removed min from date.js
Fix #305
Portuguese (Brazil) translation
Merge branch 'invasoria-patch-2' into develop
Fixed broken toSlug method. (Fix: #301)
Fixed broken attributes in sidebar (Fix #304)
Merge branch 'Denney-title-required-override' into develop
Small clean up
Merge branch 'Denney-override-time' into develop