Merge pull request #7 from tmoc/_setupArrowKeyBreakpoints

Created function to access breakpoints with arrow keys during presentation. Still needs to be refactored.
Merge pull request #8 from tmoc/breakpoints

Fixed speed issue with arrow key breakpoints.
Factored our positioning into a PositionModifier subclass.
Created a MoveTo modifier
Merge pull request #9 from onetruebob/featureSubclassModifers

Feature subclass modifers
Added rotation modifier (parameterized to rotate around the x, y, or z axis from the middle)
Merge pull request #10 from onetruebob/featureRotateModifier

Added rotation modifier (parameterized to rotate around the x, y, or z a...
Updated UnitConverter to support conversion between radians and degrees.
Created modifier that will rotate an actor a certain number of degrees along a specified axis.
Updated Stage to test multiple modifiers
Merge pull request #11 from onetruebob/featureRotateToModifier

Feature rotate to modifier
Merge pull request #12 from onetruebob/featureTestModifiers

Updated Stage to test multiple modifiers
Implemented fix to PostionModifier so the actor always starts and stops at the same place at the end of it's range.
Merge pull request #13 from onetruebob/fixPositionModifierStopStart

Implemented fix to PostionModifier so the actor always starts and stops ...
Added opacity modifier and fixed arrow key commands for reverse scroll direction.