add Help menu
Merge pull request #298 from Alys/helpMenu_0827

add text for new Help menu
fix(inventory): disallow buying if !item.canOwn(user)
semi-random tentative crappy code for improving quest aborting, especially when the quest owner has left the party
change "submission" to "set of submissions" as requested in private staff/mods [G+ post](https://plus.google.com/u/0/114447825469587375506/posts/YH5UKKGuxbJ)
improve message for when quest owner has left
add text and improve existing text for cancelling/aborting quests and for reporting on various situations in which quest owner is no longer in quest or in party
Merge pull request #299 from Alys/setOfSubmissions-Sep06

change "submission" to "set of submissions" in Player Tiers box on Tavern page
implement pushToBottom
grunt():
adjust party/guild/group terminology to be more accurate
fix rebirth issues: reset levelDrops, wipe buffs, deequip all gear types
add noMount flag which is true for Plain Eggs so they can be hidden on the Mounts page
Merge pull request #306 from Alys/partyTextFixes-Sep10

adjust party/guild/group terminology to be more accurate
fix(i18n): "Cool" => "Tell Me Later" (people keep clicking cool, keeping
bailey around forever)
Merge pull request #307 from Alys/rebirthFixes-Sep10

fix rebirth issues: deequip all gear types, reset levelDrops, wipe buffs
Merge pull request #308 from Alys/eggMounts-Sep11

add noMount flag for Plain Eggs to hide them on Mounts page
Merge pull request #302 from Alys/questAbortFix

add and improve texts related to cancelling and aborting quests
Merge pull request #304 from Alys/pushToBottom-sortFix

add support for pushTaskToBottom to help with To-Do sort order bug
fix(i18n): fallback for failing i18n compilation