Spidermon

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- Add SPIDERMON_EMAIL_CONTEXT setting to pass custom contexts to email actions.
- Add support for Schematics 2.1.0.

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- Convert the job ID tag into a clickable button.

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- Avoid requests to get the amount of lines in the log by default, because
they consume too much memory and they are very slow. You can still use
the old behavior adding ``show_log_count`` to the context before creating
the email message.
- Refactor the requirements in setup.py.
- Update the Sphinx configuration.

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- Add support for periodic monitors in the Scrapy extension.

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- Modify ItemValidationPipeline in order to support dict objects in addition
to Scrapy.Item objects.
- Refactor ItemValidationPipeline to make it easier to extend this class.

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- Add Schematics 2.* support. Note that Schematics 2.0.0 introduced many
changes to its API and even some validation rules have a slightly different
behaviour in some cases.
- ItemValidationPipeline optimisations for cases where no validators can be
applied.