Adding content to support splash loading page for dictionary loading

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• Added an overloaded Application class (called GameLabApplication)
• Added utility methods for the dictionary to get loaded in the Application class (not in onCreate, but in another accessor method)
• Changed accessor methods in the Boggle game classes to reference the application instance and removed all loading of the dictionary when the Boggle activity launches
• Added a SplashScreen activity to be the default application launch activity. The UI for this activity gets loaded directly from an XML resource and so does not interfere with the object being loaded.

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Merge this onto the master branch :tada:

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First, fix the ic_infinity_edited.xml file to have a background color so it isn't just default black with weird loading timings...