Merge pull request #52 from aschnell/master

- updated .gitignore
Merge pull request #53 from aschnell/master

- renamed enum member to match linux vocabulary
Merge pull request #55 from aschnell/master

- documented status characters
Merge pull request #56 from aschnell/master

- fixed setting setuid bit during undochange (bnc#862964)
Merge pull request #58 from aschnell/master

- fixed empty-pre-post cleanup algorithm
Merge pull request #59 from aschnell/master

- added systemd timer files
Merge pull request #60 from aschnell/master

- allow to add snapshots subvolume to fstab (for fate#317062)
Merge pull request #61 from aschnell/master

- use RAII idiom
Merge pull request #62 from aschnell/master

- removed obsolete script
Merge pull request #63 from aschnell/master

- handle DBus exceptions
Merge pull request #64 from aschnell/master

- fixed execution of grub plugin
Merge pull request #65 from aschnell/master

- disable rollback on old distributions
Merge pull request #66 from aschnell/master

- ignore grub files
Merge pull request #67 from aschnell/master

- fixed signature
Merge pull request #68 from aschnell/master

- added rollback support (fate#317062)
Merge pull request #69 from aschnell/master

- simplification
Merge pull request #70 from aschnell/master

- minor improvements
Merge pull request #71 from aschnell/master

- increased version
Merge pull request #72 from aschnell/master

- added missing include
Merge pull request #73 from aschnell/master

- conditional for libbtrfs requires