v0.7.0

This release is mostly cleanup, updating some underlying libraries, and updating the look of the preferences window. In particular:

• Added some code which should disable Before Dawn if you're running on battery
• Updated to much newer version of Electron
• The prefs window now has tabs and should look a little nicer
• Removed jQuery from underlying source code, and removed it as a dependency
• Updated release scripts to newer electron-builder setup which works really well