2.0.0 changes

[Ben Schwarz]

Using this issue to track changes coming into CLI for 2.0.0 release.

There's been a few things we've wanted to do but didn't because we didn't want to risk changing CLI flags etc.

• Add adblocking to single page tests. Add ability to turn it on or off for a test profile (#48)
• Tidy up command line flags so that they're all --dash-separated rather than --camelCase (#48)
• Rename flags used to turn JavaScript on / off (#48)
• Remove GIF artifact download (#50)
• Move get-pulse-metrics to use the top level timeseries query method
• Add / Remove deploy markers (#52)
• Change snapshots to use snapshotsList for pagination (#52)
• Return completed, errored and timeout tests with runtimeError (#53)
• Change the metrics chart for single page tests to swap out FMP for FCP (#54)
• Match Lighthouse grade colours to app (#54)