* Adding the unopened mystery items to the call to get not obtained subscriber items. closes#7712
* refactoring according to pr
* Refactoring according to pr. moved time-travelers to it's own file and added new tests.
* pull apart achievements into different subcategories
* achievs previously hidden to others if unachieved are now always shown
* achievs previously always hidden if unachieved are now always shown
* pull apart ultimate gear achievs
* add achiev wrapper mixin
* add achiev mixin for simple counts
* add achiev mixin for singular/plural achievs
* add simpleAchiev mixin and support attributes
* always hide potentially unearnable achievs if unearned
* contributor achiev now uses string interpolation for readMore link
* transition to basic achiev grid layout
* fix npc achievement img bug introduced in c90f7e2
* move surveys and contributor achievs into special section so it is never empty
* double size of achievs in achievs grid
* achievs in grid are muted if unachieved (includes recompiled sprites)
* fix streak notification strings
* add counts to achievement badges for applicable achieved achievs
* list achievements by api
* fix achievement strings in new api
* unearned achievs now use dedicated (WIP) 'unearned' badge instead of muted versions of the normal badges
* fix & cleanup achievements api
* extract generation of the achievements result to a class
* clean up achievement counter css using existing classes
* simplify exports of new achievementBuilder lib
* remove class logic from achievementBuilder lib
* move achievs to common, add rebirth achiev logic, misc fixes
* replace achievs jade logic with results of api call
* fix linting errors
* achievs lib now returns achievs object subdivided by type (basic/seasonal/special
* add tests for new achievs lib
* fix linting errors
* update controllers and views for updated achievs lib
* add indices to achievements to preserve intended order
* move achiev popovers to left
* rename achievs lib to achievements
* adjust positioning of achieve popovers now that stats and achievs pages
are separate
* fix: achievements api correctly decides whether to append extra string for master and triadBingo achievs
* revert compiled sprites so they don't bog down the PR
* pull out achievs api integration tests
* parameterize ultimate gear achievements' text string
* break out static achievement data from user-specific data
* reorg content.achievements to add achiev data in related chunks
* cleanup, respond to feedback
* improve api documentation
* fix merge issues
* Helped Habit Grow --> Helped Habitica Grow
* achievement popovers are muted if the achiev is unearned
* fix singular achievement labels / achievement popover on click
* update apidoc for achievements (description, param-type, successExample, error-types)
* fix whitespace issues in members.js
* move html to a variable
* updated json example
* fix syntax after merge
* fix: confirm no user objects reference a group before deleting it when the member count reaches 0
* Updating mongo queries to return promises and use the select statement.
* Implementing retries on failed user updates when finishing a quest. fixes#8035
* Refactoring mongo db retries to use the same as code path as original call and moving retries to count based over time based.
* Adding tests for retry logic and updating retries to happen recursively
* Moving callbacks to promises and other tweaks according to pr.
* Chaging mongoose promise to use .catch() functionality
* If all retries fail, the system will now throw an error instead of returning an error message.
