ADD: ApiUrlService  getApiUrl / setApiUrl  as preparation for custom Endpoints inside the mobile app
change ApiUrlService.getApiUrl to ApiUrlService.get
add markdown as angular filter
Merge pull request #288 from negue/apiUrlService

ApiUrlService as preparation for custom endpoints
Merge pull request #318 from negue/markdown_notes

add markdown as angular filter
fix(memleak): add a "nullify" function to user wrapper. This is stupid,
find a better way. See HabitRPG/habitrpg#4079
feat(backgrounds): october backgrounds
feat(spookDust): add the spookDust special spell, like snowballs. Note: this is handled specially so spookDust can be bought with GP, is a WIP
feat(backgrounds): replace spookyForest with pumpkinPatch
fix(spookDust): user serverside method for spookdust as it's path-protected
upgrade moment.js