Merge pull request #378 from BU-CS673/production

production -> Canfield
Merge pull request #381 from BU-CS673/production

Production -> Canfield
Moved thumbs to wiki, from res, since they aren't game related

They are used in documentation only. The res folder is distributed with
the game, and everything in it should be used by the game.
Fixed client crash if server clicked start game multiple times
Spawns are no longer visible, except in the TankRespawnTest
Added 6 more unit tests; resolved #380
Tanks now respawn with full ammo & mines, and lose all trees
TankSprite.updateColorSet() now called once, instead of every tick

Also cleaned up TankSprite a bit.
Additional LobbyScreen fixes
The tank now explodes on death
There is now a 1 second respawn delay on death
Additional sounds
All sounds are now properly disposed
Sound fixes; Mines now do ~10 damage, instead of 5000
Trees now play a small sound when hit by a bullet
More unit tests; Updated AudioTestApplication
Added sounds for PillboxHit, WallHit, TankHit
Fixed the first bullet pause issue
Mines no longer blink until they are armed
Fixed sound overlap issue, which was caused by mines