Added interface for controlling the behavior of the hasts system.  Added support for negative haste.  Moves haste rate calculations to UpdateHasteRate.  GetHasteRate now just returns the calculated value.  Added FLOAT_NO_SPEED_INTERFACE and FLOAT_TABLE_INTERFACE macros to OptionsBinding.h
Had wrong documentation for SongOptions:Haste.
Merge pull request #155 from kyzentun/negative_haste

Negative haste and themable haste