Refactor _fetchWithBootstrap to process seriesList
Refactor _fetchWithBootstrap to process seriesList

Since _fetchWithBootstrap does a re-fetch of data, it needs to
handle an entire seriesList to do so cleanly. It now handles series
pathExpressions which return multiple series in a seriesLists

Likely other edge cases still exist but I think many less than now

Krylon360/evernote-graphite-web,Krylon360/evernote-graphite-web,Krylon360/evernote-graphite-web,Talkdesk/graphite-web,Talkdesk/graphite-web,Talkdesk/graphite-web,evernote/graphite-web,evernote/graphite-web,Talkdesk/graphite-web,Krylon360/evernote-graphite-web,Talkdesk/graphite-web,evernote/graphite-web,Krylon360/evernote-graphite-web,evernote/graphite-web,Talkdesk/graphite-web,Krylon360/evernote-graphite-web,evernote/graphite-web