Changes from of Feb 20th, 2017 to Feb 27th, 2017 (1d15fa1...e637cda)

Changelog

• added: Tooltips for sunburst graph
• added: xcode partial line detection
• known: Uploading to many reports to the same commit causes major issues. New hard limit of 20 uploads is now enforced until we optimize processing.
• fixed: UI navigation when clicking on Totals object from repos list
• improved:https://docs.codecov.io/docs/comparing-commits#section-comparing-pull-request-base-reports
• added: