New Feature - Seed Favorites! (also bug fixes)

Hello again!

Today is exciting - I have added a new feature! Saving your seeds! If you want to play a board again, simply hit the little star button beneath the game board to save the seed, and it'll show up, available to play. Beat your own high scores, or challenge your friends. 

Additionally, I've fixed some bugs I didn't realize were an issue, so enjoy the improved performance. If you come across any bugs of your own? Let me know (steps to reproduce would be good too ). 

Thank you so much, and have fun!