Merge pull request #72 from SableRaf/develop

Develop
Merge pull request #76 from SableRaf/develop

Started implementing brush size indicator (no yet functionnal)
Removed keystone library. We're not using it anymore.
Merge pull request #77 from tugelbend/develop

Removed keystone library. We're not using it anymore.
Fixed bug #71

Screenshots are now saved with date and time as part of the filename
Merge pull request #81 from tugelbend/develop

Fixed bug #71
Put the mouseRobot in a thread
Added keys for suspending the mouse robot (s)  and for quitting the program (q)
Merge pull request #83 from tugelbend/develop

Develop
Added OneEuroFilter tests
Added OneEuroFilter tests