* This might have caused the Amazon updater to fail
  on Windows the first on `rake db:reset`

Usage:

* `rake jobs:update_providers`
* `rake jobs:update_providers_async`

* No pricing data included in API responses !
* Region area is not detected yet

Options:
a) Write a new crawler for the updated pricing Web page
b) Combine the data from API somehow with the pricing Web page
c) Query a 3rd party service that maintains their own crawlers or manually updates prices

Discard Azure API approach

Using the 3 major provider produces a nicer curve

* Add comment about speedup using a transaction

The `MeanTimeReporter` is very helpful to identify slow test,
which is particularly useful when optimizing code.

We currently do not consider storage at all.
Whenever we need it back, we have it in the Git history.

Provides a helper method that generalizes the heuristic
to identify region areas.

* Use the `RegionArea` module to reduce duplications across provider updaters
* Break class into smaller methods
* Add transaction to make creating 428 resources ~0.4 seconds faster
* Remove storage mocks from test (the mock files are still left in fixtures)
* Raise error instead of fail silently :(
* Add useful test assertions (e.g., check for unmatched region area)

This speeds up bulk updates. Needed to split up some long methods into a `update_compute` method.

* Also fixed the prefix constant causing issues when running multiple tests
* Some minor test refactorings