Import dates of entries
Add setter specs for dates
Install and init Timecop
Serialize node dates and change type to DateTime
Set column width for sizes to 3
Move load and save from node to tree persistence class
Add save and load to persistence base class
Make history persistable
Move require statements to autoload section
Autoload history and tree
Improve keepassx importer and convert br tags
Remove printing backtrace of execeptions