Added profling (again)
current_url in driver was not cached, now is local
Partially removed waittime metric, added url cache
Added thinktime to all sleep functions.

ThinkTime determines how often those individual functions poll a page
for changes. For example, waitToDisappear starts with the default 2x
child thinkTime.
Merge branch 'profiled'
Merged from profiled, removed profiling
Removed statistics's waittime entirely.