#15 Support mapping to multiple DB sources

[David Bainbridge]

It might be nice if SQLREST would allow the
specification of mutiple DB sources so that it could
front end connectivity via a single HTTP end point to
these databases making it an integration interface
across multiple resources. At the same point it would
be useful to be able to specify the list of
tables/views which you would like published as
resources.

A config of the style:

<sources>
<source>
<name>source1</name>
<datasource>
<jdbc-driver-class>org.hsqldb.jdbcDriver</jdbc-
driver-class>
<database-
url>jdbc:hsqldb:hsql://localhost</database-url>
<user>sa</user>
<password></password>
</datasource>
<resources>
<resource>
<url>/level/level/resource</url>
<table>TABLE_VIEW_NAME</table>
</resource>
</resources>
</source>
<source>...</source>
<source>...</source>
</sources>