1. We need a pool for apr_stat.  Expand api and create a pool when necessary.
2. Don't use -1 value in enum for no reason as they can be signed or unsigned (compiler defined) so there is an int overflow.  This fixes an incorrect assert in the spidermonkey exception handling caused by an unsigned int overflow.

resolve http://jira.freeswitch.org/browse/MODLANG-7. 


git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5002 d0543943-73ff-0310-b7d9-9358b9ac24b2