Update Hill_Climb.ino

Corrected typo of moveBackward function.
Merge pull request #1 from sigadore/patch-1

Update Hill_Climb.ino
Added special meaning to 0 and -1 as move function values
interrupt clear addition
2x Sparki speed: Changed improper speed code
Fixed hill climb example sign error
Fixed line following code so it moves forward when line centered
Added screen display to line following example
Added default program with added edge avoidance
Corrected remote example to match default code
Changed edge avoidance to more reasonable value
2nd though, Removed edge avoidance from default code
Fixed definition error causing LCD code not to work
added LCD examples
Added links to part pages
fixed drawPixel
removed LCD drawPixel color
Updated line-following example
Updated line-following example
Changed error with moveRight code