schmittjoh/serializer — pull request #341 by xavierlacot (2014-09-18 10:14:30+00:00)
Title: Allow multiple nested serializer calls

In case of serializer recursion, the serializer send an exception: "Can't pop from an empty datastructure", as noted by @damienalexandre in #319

This PR allows to stack the navigator association to visitors, thus making it possible to nest serializer calls. It contains two commits:
* the first one contains the required changes for the bug to be fixed;
* the second one adds a test which shows up the bug resolution (tested against the fixed testsuite proposed in #292)