to address ARI-3771 "Lasalle Facebook last scrolldown doesn't work", scroll by 200 pixels each time instead of 100 on facebook, which avoids hitting the 15 second idle timeout in my tests; also detect when unclicked targets are above the screen/viewport and not below and log it as such, instead of trying to continue scrolling down
Merge pull request #18 from nlevitt/ari-3771

to address ARI-3771 "Lasalle Facebook last scrolldown doesn't work", scr...