Filex #41 - Step Bug

Walking path now has 5 frames instead of 3.
Add myself as a contributor :)
Fix general toneblit. Fixes #59 (disable pixman)

PixmanBitmap::ToneBlit() was disabled since the general
Surface::ToneBlit() do the work correctly. We should decide if open an
issue to rewrite this.
another aproach to fix #41

Every move_speed has his own anime_count and i cant find a formule to
make it work.
Fix #41 & Fixes max move_speed bug

Final aproach to solve this bug.
Also solves an unreported bug: maximum speed was 8 and RM 2000/2003 only
allow a maximum of 6.
Merge pull request #75 from MarianoGnu/master

Fix #41 - Step Bug and #59 - Tone Blit