Minor cleanup for convention and readability
Merge pull request #1257 from kumabotz/minor-cleanup

Minor cleanup for convention and readability
Added a button in the level editor to choose which team to play when editing a ladder level.
Tweaked the styling for guides to only center emphasized lines immediately after an image. Made the styling also show up on the level editor.
Merge branch 'master' of https://github.com/codecombat/codecombat
Added styling for tables in the guide.
Added underscore.string to the worker.
Changed the angel logigng to use info instead of log, to more easily differentiate.