shinyloadtest 1.1.0

record_session() gained a new variable connect_api_key to be able to
record a session against RStudio Connect using a Connect API key. Please see
Load Testing Authenticated Apps
for more details. Using a Connect API key also requires shinycannon >= 1.1.0
(#133)
load_runs() now uses vroom instead of read_csv(); this substantially
improves its performance.
The homepage has been rewritten to get to the big picture more quickly.
Most of the details about shinycannon have moved to a new article.
The analysis vignette has been overhauled to get into the plots more quickly,
and provide more advice about interpretation.
Plots have be thoroughly overhauled:
- Waterfall plot now only shows plots in maintenance period, and
  times are session relative.
- Sessions in warmup and cooldown are no longer shown in muted colours,
  because that unfortunately relied on a ggplot2 bug. Instead they're
  simply omitted from the plot.
- The line of best fit in the latency plots has been made less visually
  prominent, and no longer shows standard errors.

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