Common container should have a mechanism for out-of-the-box user preference substitution

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Main Issue
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The common container should have some mechanism for user preference replacement out of the box (at least for default pref values).

Currently, the preference templating feature relies on the JavaScript container to do the preference value substitution / interpolation. It also allows for caching of the metadata request even if the preference values change.

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Related JIRA Issues
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[1] https://issues.apache.org/jira/browse/SHINDIG-1465
[2] https://issues.apache.org/jira/browse/SHINDIG-1926

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Related Shindig Mailing List Thread
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http://shindig-dev.markmail.org/search/?q=template%20preference#query:template%20preference+page:1+mid:7bksognivvne3g3x+state:results

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Background Information
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PROBLEM

Several external 3rd-party gadgets fail to render properly using the common
container due to the preference templating feature in Shindig.

e.g.
(1) The Daily Puppy - http://dailypuppy.com/gmod/thedailypuppy.xml
(2) NYTimes.com Top Stories -
http://widgets.nytimes.com/packages/html/igoogle/topstories.xml
(3) YouTube: http://www.gstatic.com/ig/modules/youtube/v3/youtube.xml
(4) Hamster:
http://hosting.gmodules.com/ig/gadgets/file/112581010116074801021/hamster.xml

This issue affects the following Shindig versions:

• Shindig 2.5.0 Beta 6
• Shindig 2.5.0 (final)

Note: This issue does not affect the deprecated shindig.container using the same Shindig builds & 3rd-party gadgets.

See JIRA issue for more details
https://issues.apache.org/jira/browse/SHINDIG-1926

SOLUTION (Verified)

Disable preference templating feature by adding
shindig.urlgen.use-templates-default=false to shindig.properties and
rebuilding Shindig (Recommended by Ryan). By default the common container uses templates for preferences.