Fixed NullPointerException when a player placed a marker.
Added in a functional TimeoutClock.
Cloud replay now works with button functionality:

*Added "next move" button to different activity views.
*Modified visibility of "next move" button in gameplayview
*Modified cloudReplay() function and CloudThread class in gameplayview
*Added onReplayButtonClicked() function to handle cloud replay button presses. This is due to placeMarker() being called in onButtonClicked()
This is a major update, includes a main menu screen, and cloud-replay-button functionality, updates are as follows:

*Added activity_main_menu.xml
*Added MainMenu.java activity
*The functionality for main menu only works on single player and cloud replay options.
*Single Player
	-Proper parameters are passed through intents to 	determine what type of game, and what type of 	options the game has(board size, timeout etc)
	-GameplayView has been modified to reflect the 	extra passage through intents.
*gameType variable in GameplayView class contains a comment above it that describes what each integer corresponds to.
*Back button press is ovverode in main menu to allow for a switching between content views.
*deleted file main_menu.xml
*updated timeouts to 15, 30, and 45 seconds in both single player and multiplayer game config xmls.
Merge branch 'heru' into develop
This is a major update, includes a main menu screen, and cloud-replay-button functionality, updates are as follows:

*Added activity_main_menu.xml
*Added MainMenu.java activity
*The functionality for main menu only works on single player and cloud replay options.
*Single Player
	-Proper parameters are passed through intents to 	determine what type of game, and what type of 	options the game has(board size, timeout etc)
	-GameplayView has been modified to reflect the 	extra passage through intents.
*gameType variable in GameplayView class contains a comment above it that describes what each integer corresponds to.
*Back button press is ovverode in main menu to allow for a switching between content views.
*deleted file main_menu.xml
*updated timeouts to 15, 30, and 45 seconds in both single player and multiplayer game config xmls.