[Toaster] Patches upstream 5/9/16

[Michael Wood]

The following patches have been applied to toaster-next and sent to 
bitbake-devel. Thank you to Ed, David and Belen.

Belen Barros Pena (7):
   toaster: tasks Remove recipe version from defaults
   toaster: configuration Provide machine help text
   toaster: layer details Layout fixes
   toaster: import layer Layout fixes
   toaster: layer details Fix "edit" form interaction
   toaster: Allow forward slash in variable names
   toaster: orm Update IMAGE_FSTYPES values

David Reyna (1):
   toaster: keep layer name in variable history path

Ed Bartosh (3):
   toaster: don't kill toaster on start
   toaster: remove handling of .toasterui.pid
   toaster: don't kill all runserver processes

Michael