Rather than depending on the bower_components directory built by
`bower install`, use the Buck build and serve components directly from
polygerrit_components.bower_components.zip. Add a filter in front of
PolyGerrit index paths to recompile bower_components.
The end result is developers can run:
buck build polygerrit && \
java -jar buck-out/.../polygerrit.war --polygerrit-dev ...
to start up a PolyGerrit dev server serving local content, without the
need for Eclipse, and that doesn't need to be restarted even if
bower_component deps change.
Change-Id: I8658a2b03ff8ecb6824092e02411ba3b67d37569
788cb87f97