Upgrade version to 0.4.4

Update version to v0.4.3

Adds travis

Fixed service crash when initial state is SavingFile

Refactored code

Added SystemOperation interface to execute all operation that depend on
OS and UserInteraction interface to receive command from user.

Notify download status

While the client is downloading a file send a feedback to the server
every 10% downloaded

Update readme and license header

Setup project