Redshift Plasmoid 1.0

In this release the code has been cleaned and commented with doxygen style comments, the files hierarchy has been changed to make everything more clear, the README has been updated and ported to markdown syntax. Because of all this changes the code is now supposed to be easily maintainable.

Other changes:

• RedshiftApplet: Improve plasmoid status behavior (when switching to manual mode the widget icon won't move before few seconds to allow to user to end its interaction)
• RedshiftApplet: Add global shortcut to toggle redshift on/off (can be set up in the shortcut tab of the plasmoid configuration dialog)
• Translations: Add Czech translation (thanks to Pavel Fric)
• Translations: Add Spanish translation (thanks to ThecaTTony)