Merge pull request #1 from lefnire/pets

add "hatching powder" (as temporary pet food), clean up some dialogs, fix eggs using their actual animal sprites
add habitrpg-github to extensions (thanks @ruddfawcett!)
temp fix to undo being hidden
Merge pull request #2 from lefnire/pets

Many pets fixes
add min-width fix to hero-stats being squishd on smalls screens.
@zakkain feel free to change, just wanted a quick-fix
Merge branch 'develop' into pets
pets: alert & return if they already own that pet
Merge remote-tracking branch 'switz/inventory' into pets
pets: bug fix - user.remove(path, idx, count) was wiping the whole
eggs/food arrays on page refresh, using array.splice &
user.set('items.food', splicedFood), etc
pets: show specific egg in inventory
pets: move inventory into <menus>