Added history feature (No autorun)
Updated README.md
Histroty function refactoring
Added history rotation backend function
Merge remote-tracking branch 'upstream/master'
Improved backend helper classes documentation
Improved backend history code and added automatic history rotation based on the frontend 'expire' setting
Exposed stored history list using api
Applyed recommended fixes
Merge pull request #58 from anryko/master

History feature implementation