ENYO-2950: enyo can load file of which the extention is capital letter

Enyo-DCO-1.1-Signed-off-by: Junil Kim <logyourself@gmail.com>
Merge pull request #426 from enyojs/ENYO-2950

ENYO-2950: enyo can load file of which the extention is capital letter

Reviewed-By: Ben Combee (ben.combee@lge.com)