Added function to store the current Lync status.

The current status is written to `$TMPDIR/sleepwatcher-lync-status.txt`
Reading value from file and setting status back to the stored value.
Using environment variables.
Using store/restore scripts on dim/wakeup.
Updated readme
Merge branch 'feature/store-status' into develop
Added known issue (language).
Added version.
Version 0.0.2
Merge branch 'release/0.0.2'