Add a siteName, siteLogo and backgroundColor.

fixes #85
handle kpi data that contains no event stream.

* Pass errors up the stack during initialization
data-->datum
Added new user bounce rate (query, report and view)
Added segmentations to new_user_bounce
count both idp and fallback users in new_user_per_day report
update new_user_success report to account for idps as well as fallback users
removed new_user_success queries (using new_user_bounce instead)
Remove missing stage from password_reset stages
rewrite password_reset query to use simpler reduce method
First password reset stage was incorrect; use reset_password_staged to detect reset
Added IdP vs Fallback segmentation
password_reset report needs to match query; trust newUserSteps over email_type
fixed conflict in password reset query
Merge pull request #93 from kparlante/new_user_bounce

New user bounce; IdP segmentation added