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[EAGLE-815] Add eagle alert template, severity and category support

Support alert template to generate human readable message

# New Features
* Support to define alert template in PolicyDefinition
* Support to generate alert event (subject&body, instead of using AlertPublishEvent for less changes) based on policy'template and alert event as context
* Dynamically load policy metadata in alert publisher
* Integration VelocityAlertTemplateEngine in alertPublisherBolt with metadata lifecycle
* Support persist alert message in AlertEntity as immutable field.
* Refactor alert mail template using https://github.com/mailgun/transactional-email-templates
* Refactor Alert Template to become simple and human-readable.
* Add Alert Category
* Add Alert Severity (notification template color will change according to different severiy): UNKNOWN (blue), OK(green), WARNING (orange), CRITICAL/FATAL (dark black)
* Add Alert Subject &Body Template Engine, for example:
    * Sample Event:

          {
              "host": "localhost",
              "timestamp": 1480319108000,
              "metric": "hadoop.cpu.usage",
              "component": "namenode",
              "site": "test2",
              "value": 0.96
          }

    * Sample Subject “RESOURCEMANAGER JMX Metric Alert” is defined by:

           $component.toUpperCase() JMX Metric Alert

    * Sample Body is defined as:

            An alert happened on <strong>$component</strong> (<strong>$host</strong>) of cluster <strong>$site</strong> at <strong>$ALERT_TIME</strong> because <span style="color: red">$metric = $value</span>

* Add VelocityTemplateParser

# TODO
* Integrate velocity parser into policy validator, make sure the template only contains `global variable` and `alert stream schema fields`.
* Add alert definition preview

Author: Hao Chen <hao@apache.org>

Closes #711 from haoch/EAGLE-815.

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