Add 'Roadmap for 2.8'

Roadmap-for-2.8.md

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+The minimum requirements for a 2.8 release:
+
+* Finish add-ons system
+** Add hooks for add-ons to be able to inject into pages
+** Clean up look'n'feel of Options addon
+*** Selenium tests for addon
+** Finish Color Picker Theme Adjustor Addon
+** Finish Options Configuration
+* Finish refactoring as much into ComicPress object as possible
+** Unit tests
+* Selenium tests for theme
+** Build a sample data set for testing
+* Move to using Media Library
+** Add comic image order sorting meta box
+* Move hovertext/transcript meta boxes to theme