Move ie8-responsive-file-warning.js one dir up.

This is a regression of d08bbdc6ec50baca9e34d2aa6e8bcfc8d6135217.
Update grunt-contrib-less to v0.11.0.
Fix vertical alignment of temporal inputs on iOS

Fixes #13098
Closes #13099
grunt dist
Merge pull request #13101 from twbs/ie8-responsive-file-warning

Move ie8-responsive-file-warning.js one dir up.