Brought in groups.json from original branch
feat(event): Winter NPCs
chore(grunt): grunt full

Also flips Ian NPC to standard spritesmith instead of animated GIF.
feat(event): Winter Wonderland 2015 gear
fix(event): head, not helm
feat(event): Wintery Hair Colors

Also removes an accidental duplication of a prior hair resource.
Merge pull request #400 from SabreCat/winter2015/npcs

Winter 2015 NPCs
Merge pull request #401 from SabreCat/winter2015/gear

Winter Wonderland 2015 Gear
Merge pull request #402 from SabreCat/winter2015/hair

Wintery Hair Colors for Wonderland 2015
chore(grunt): grunt full
feat(news): Promo images
chore(grunt): grunt full
Merge pull request #403 from SabreCat/Bailey

Promo art
chore(i18n): update locales
Merge branch 'develop' of github.com:HabitRPG/habitrpg-shared into add-flag-to-chat
create style guide for gear/equipment descriptions based on ShilohT's suggestions in https://github.com/HabitRPG/habitrpg-shared/pull/372
update formatting for gear style guidelines
update formatting for gear style guidelines
update formatting for gear style guidelines
update formatting for gear style guidelines