ENYO-577: Standardized the implementation of the uppercase property.
Removed all instances of `text-transform: uppercase` from CSS.
Deprecated the old function names.
Updated samples to use newer code.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
Updated the contentUpperCaseChanged to use uppercaseChanged instead of duplication.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
Merge pull request #1835 from enyojs/ENYO-577-blakestephens

ENYO-577: Standardized the implementation of the uppercase property

Reviewed-By: Derek Anderson (derek.anderson@lge.com) 
Integrated-By: Aaron Tam (aaron.tam@lge.com)