Replace usage of deprecated variable with view block.
Merge pull request #168 from cakephp/3.0-cleanup

Replace usage of deprecated variable with view block.
Faciliate links that are disabled

e.g. current page links described in http://css-tricks.com/pointer-events-current-nav/
Merge pull request #169 from simkimsia/patch-1

Facilitate links that are disabled
Make datetime select boxes display inline.
Fix hard to read text on sidebar buttons.
Merge pull request #170 from cakephp/css-tweaks

CSS tweaks
Switch from `login` to `username`

As per cakephp/cakephp#4861
Merge branch 'master' of https://github.com/cakephp/app