stuntcat 🏍️ 😼 0.2.0

This release stuntcat ( 🏍️ 😼 ) release comes with a lot of polish. Both on the outside and on the inside.

Thanks to the following people for their improvements:

• René Dudfield ( @illume ) did more refactoring after the other PRs didn't recieve any attention for some months and they needed to be merged in #67 then did some more improvements for a release in #68
• NachoMonkey ( @nachomonkey ) Made a whole lot of general improvements in #65
• Dan Lawrence ( @MyreMylar ) improved the code a lot and fixed many pylint issues in #65

@nachomonkey made a fairly detailed list of changes

• Created the StuntCat logo and added the SVG to the README.md file
• Improved the intro screen by adding shading, illustrations, and the logo
• Disabled the "elephant" because it is not ready for production
• Added three "boing" sounds that are played when the cat is hit by a NotFish or get bumped back onto the screen
• Added three "meow" sounds are played at random times
• Sound system now supports fadeout
• Added a splashing sound for when the cat falls into the water
• Added cat crashing sound
• Replaced shark attack and shark gone sounds
• Replaced "zirkus" sound with applause sound
• "shark_appears.ogg" sound is stopped when the shark goes underwater
• Replaced main menu song
• Changed jump physics so the cat doesn't lose all Y-velocity on jump button release
• Added SPACE as a jump key
• Improved jump sound
• Added a shark laser image
• When the cat gets hit by the laser, the crowd boos and throws more not-fish for a time
• The shark and elephant now leave when the cat dies
• The score text is now centered on a point, and no longer gets erased by objects
• Fixed libpng color profile errors
• Added more contrast to the fish images
• Shark now pauses a bit before firing in the 'aiming' state
• Replaced "cat_laser_2.ogg" with "cat_shot.ogg"
• Animated the cat's tail
• Removed old use of "cat_wheel.ogg" and replaced it with a looping unicycle sound with velocity-dependent volume
• Version is now defined under stuntcat/__init__.py
• The resources.gfx function now accepts the convert and convert_alpha arguments
• The window caption is now "Stunt Cat"
• Added some texture to the tent in "background.png"
• Modified "intro_screen.png" so that the polka dots are symmetrical
• The cat's rotation now affects his X-velocity (he a bit rolls in the direction he's facing)
• Added basic joystick control
• Updated the "gameplay.gif" animation
• README.md improvements
• Fixed most of the alerts raised by lgtm
• Added shebang (#!) to run_game.py for Linux