Merge pull request #4 from saukko/key-value

Make it possible to query any key value pair from device data section.
Rewrite settings from settings.d only if there are new changes; move board mappings to settings.d
Disable echo on rndssu password prompt
Only sync after complete files; use QDir filter for ./..
Use the release() function for gettings release.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
Replace QDir::NoDotAndDotDot with QDir::NoDot|QDir::NoDotDot for Qt5
Add linebreaks to rndssucli messages
Add basic variable resolver and unit tests
Start using new variable resolver; sync all writes to settings
Merge branch 'master' of github.com:nemomobile/ssu into key-value