Merge pull request #57 from crystalphoenix/develop

Corrected placement on rouge_6 weapons
fix https://github.com/HabitRPG/habitrpg/issues/2064 , make sure to
stack buffs
make stealth higher level & mp requirement
grunt spritesmith
passive-stats balancing round 2
comments with results on math_samples
add spells to math_samples
math_samples fixes for spells, consequent spell balancing
show tasks dodged # in math_samples, balance stealth
small exp tweak, grunt for spells
fix layering of beard over chin
add fortify as potion on 'special items'. Some inventory css tweaks
winter event! npcs, snowball=>snowman, new hairs/beards
rename head_special_winter to head_special_candycane
add salt spell to remove snowman effect
winter: add snowball badge stack, remove candycane hat for now
Fixed some tests
Merge branch 'winter' into develop
Fix drop system tests
math-balancing WIP for passive stats & abilities