Bug 1018915 - [Building blocks] Update object menu to give more flexibility to lists
Bug 1017314: Load tutorial config in a loadConfig method. r=borjasalguero

* Start tutorial preload in ftu UIManager.init
* Create per-layout tutorial config file, use l10nKey as title property name in config
* Refactor Tutorial to loadConfig/ensureConfig and update tests accordingly
* Remove unused data-maxstep attributes.
Bug 989153: Opening an email with a very long subject does not gracefully truncate
Bug 1018942 - Collection App Testing r=armirn
Merge pull request #19807 from sfoster/configurable-tutorial

Bug 1017314: Load tutorial config in a preload method. r=borjasalguero
Merge pull request #19858 from rsajdok/bug#989153

Bug 989153:  long email subject not wrapping r=jrburke
Merge pull request #19893 from KevinGrandon/bug_1018942_collection_testing

Bug 1018942 - Collection App Testing
Merge pull request #19875 from pacorampas/tuning-object-menu-1018915

Bug 1018915 - [Building blocks] Update object menu to give more flexibil... r=me
Bug 1009535 - [FTU] Ensure navigation progressbar shows steps within limits. r=fcampo