The animation of the "fire" mark is not reset with the action.
Adjusts the force given to the cart according to the angle of the ground.

Due to the changes on the behavior of the slopes in the engine, we have to
adjust the force en order to maintain the original behavior of the cart.
The coefficients are carefully chosen in order to provide a similar
feedback to the player.
Ajust the force given when the player is crouched.

The factor must be adjusted with the angle of the ground in response to
the recent changes in the behavior of the slopes in the engine.
Adjusts the intro in response to the new behavior of the cart.
Merge branch 'master' of github.com:j-jorge/asgp into android-merged-textures
Fixes some decorations in the levels using the western theme.