Copyright (C) 2014, 2015 Julian Marchant <onpon4@riseup.net>

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.  This file is offered as-is,
without any warranty.

========================================================================

0.8.1
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Bugfixes:
- References to "xsge.physics" remaining in the documentation


0.8
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Misc changes:
* Renamed from xsge.physics to xsge_physics.


0.7
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Misc changes:
* Updated docstrings to stop referencing old directional collision events.
* xsge.physics collision methods now have a "move_loss" attribute,
  indicating how much movement was lost as a result of the collision.
  (Only applies to Collider objects; MobileWall objects don't lose
  movement as a result of collision, so they don't have the new attribute.)


0.6
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Misc changes:
* Methods checking whether a collider is touching walls now return a
  list of such walls, rather than just returning True or False.  Less
  efficient, but more useful.


0.5
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Additions:
+ xsge.physics.MobileWall

Misc changes:
* "xsticky" and "ysticky" class attributes of slopes renamed to be more
  specific and prevent name conflicts.
* xsge.physics collision events are now special "event_physics_collision"
  events, rather than just being the regular SGE collision events.
* Slope collisions now happen before wall collisions (preventing some
  bad behavior).
* Objects now move along slopes at the speed that they should, rather
  than maintaining the same x or y velocity (and therefore zipping at
  high speed through slopes), by default.

Bugfixes:
- Incorrect behavior with slope stickiness (prevented it from doing its
  job and caused other side effects)
- Collision events in xsge.physics occurring with walls that were *behind*
  the wall that was collided with
- Getting stuck to slopes without actually touching them


0.4
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First release.
