Analysis task should show all possible revisions for A/B testing

Analysis task should show all possible revisions for A/B testing
https://bugs.webkit.org/show_bug.cgi?id=145996

Reviewed by Chris Dumez.

* public/api/commits.php:
(fetch_commits_between): When the time stamp is not available for commits, use revision numbers
to find revisions between two ranges. This is necessary for OS X and iOS versions since they don't
have a "commit time".

* public/v2/app.js:
(App.AnalysisTaskController.updateRootConfigurations): Fetch commits between two end points.
(App.AnalysisTaskController._createConfiguration): Extracted from updateRootConfigurations. List
the fetched list of commits if available.
(App.AnalysisTaskController._serializeNumbersSkippingConsecutiveEntries): Added. Serializes an list
of numbers intelligently. For example, [1, 2, 4, 5] turns into "1-2, 4-5". Without this, some lists
of points shown in the A/B testing configurations become too long.

* public/v2/commits-viewer.js:
(App.CommitsViewerComponent.commitsChanged):

* public/v2/data.js:
(CommitLogs.fetchCommits): Renamed from fetchForTimeRange.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@185574 268f45cc-cd09-0410-ab3c-d52691b4dbfc