add scroll function
Merge pull request #12 from huangnoah/update-scroll

add scroll function
fix for load big data
Merge pull request #13 from huangnoah/master

fix for load big data
add scrollbar functions
Merge pull request #14 from RaymondChao/add-scrollbar-functions

add scrollbar functions
rename getScrollXXX to getMeshScrollXXX
fix scroll function
Merge pull request #15 from huangnoah/update-scroll

fix scroll function
minor verScroll and horScroll