Lepton

- Examples are now installed as a subpackage and importable, thus may be
run using: python -m lepton.examples.vortex
- Add notes about ubuntu/debian package dependancies to readme

- Add Drag controller to simulate viscous drag (i.e., wind, water)
- Add vortex example to show off drag controller
- Improve numeric stability of Magnet controller (changes charge value scale)
- Replace inner_cutoff parameter of magnet controller with variable epsilon
- Implement SpriteTexturizer, refactor examples to use it
- Add letters example to show off texture atlas support
- Add texture support to PointRenderer via point sprites
- Add create_point_texture() function for generating blended
point textures. Refactor fire, smoke, and other examples to use them.
- Implement FlipBookTexturizer for particle texture animation
- Add animated logo example to show off FlipBookTexturizer
- ParticleGroup.new() now accepts keyword args for particle attributes.
- Add generate example

- Fix reference leaks in particle emission and domain generate methods
- Plane domains are now proper half-space geometries so they support
__contains__, which means they can be used with the Collector controller.
- Implement Point domain.
- Implement arbitrarily orientable Disc, Cylinder and Cone domains.
- Add tunnel example.
- Implement new closest_point_to() methods for various domains.
- Fix distribution of points generated in a Sphere domain with a nonzero
inner radius.
- Refactor renderer/group binding to avoid circrefs and an infinite loop
bug. This also simplifies the API. Thanks to Ken Lauer for the report.
- Fix color bug in the billboard renderer, thanks again to Ken Lauer.
- Add ParticleSystem.run_ahead() method to warm up the particle system
or "fast forward" the simulation.
- Add Magnet controller and example. Thanks to Andrew Charles for the
initial implementation of these.
- Various code cleanups and fixes for building on Windows. Thanks to
Jussi Lepistö.

- Adjusted code so it compiles with Visual C++ 2008.
Big thanks to Jussi Lepistö (Knarkles) for doing this work!
- Use PyOS_snprintf instead of snprintf for better portability.

- Fixed accuracy of bounce controller so that particles are much less likely
to escape from a container domain. (Thanks to dugres for reporting the bug)
- Fixed bug in Sphere.intersect() where it would return bogus vectors such
as (nan,nan,nan) for stationary particles in some instances. This allowed
an improvement to the bouncy example to further prevent errant particles.
- Collector controller ported to C
- Bounce controller ported to C
- Add 2D splode example to demonstrate how to use lepton with the default
pyglet OpenGL projection.
- Allow basic attribute access for the C controllers from Python
(More work is needed here for more complex attributes, like vectors)

- Fader controller ported to C
- Added per-particle emitter and fireworks example
- Port Line and Plane domains to C
- Port Box domain to C, rename to AABox. deprecate domain.Box for reuse later
- Port Sphere domain to C, add support for inner and outer radius for
spherical shells
- Bounce controller gets separate bounce and friction parameters
- Improve lame pygame fill example to use new bounce features and be less lame
(2.5D, suhweet!)
- Implement particle proxy and vector object pools to reduce or eliminate
object allocation when iterating and traversing particles from python
- Optimize particle group C typecheck function