XD-119 Changing HDFS sink default to hdfs://localhost:8020
Revert "Force eager startup of DispatcherServlet"

This reverts commit c0a951e6d82a418caec40abdd6639e2f1e44b404.
XD-361 Create trigger shell command
Added triggers link to admin controller
Added TriggerTemplate to implement the TriggerOperations for SpringXDTemplate
Added "trigger create" trigger shell command with options

Fix ReferenceDoc to include Trigger command title
Streamline exception hierarchy. Make sure they propagate to client properly
Got rid of leaf exceptions
Factor out common bean defs.
Creating JDBC sink to persist message payloads to a database table

Transforms JSON payload to a map with specified column values to provide
data values for insert statment, defaults to single column named payload
for entire payload content as is.

Defaults to reading database properties from config/jdbc.properties

Unless these properties are modified the database used is an in-memory
embedded HSQLDB instance.

This sink can be configured with the following options:

- configProperties (base name of properties file, default is jdbc)

- initializeDatabase (default is false)
  (the default jdbc.properties has this set to true)

- initializerScript (default is init_db.sql)
  (will search config directory for this file)

- columns (comma separated list of column names to include)

- the usual JDBC properties - driverClass, url, username, password