Conn-check

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- Add --include-tags and --exclude-tags args with support for the `tags` YAML check field.

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- Package manifest fixes for debian package release.

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- Output is not buffered and ordered, with FAILED checks first, skipped last,
and each check grouped by {type}:{host/url}.
- TCP subchecks triggered by a HTTP check are prefixed as such.
- There is now a -U/--unbuffered-output option to disable buffered/ordered output
and write out to STDOUT as soon as a result is collected.

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- Command aliasing refactored, and more aliases added.

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- Disabled 30x redirects in HTTP checks by default, fixing regression introduced by requests switch.
- Added python-requests specific options for proxy, param, cookie and auth control in HTTP checks.

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- Added a mongodb check type.