[workaround] do not save/load history to/from file

On low battery upowerd is saving history to files and it additionally
increases system workload drastically for a while. So, until this issue
not solved correctly switch history saving/loading off

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
Merge pull request #5 from deztructor/master

[workaround] do not save/load history to/from file