wq_specify_log now returns 1 if log could be opened.
batch_wq logs using work_queue functions.
Merge pull request #342 from btovar/batch_wq_log

Batch_job_wq now logs using the standard Work Queue log format.  Fixes #295.
Add abort flag check.
Fix bug where current deref as NULL.
Include child exit information in Chirp debug.
Note swig optional dependency
work_queue: fix paths to work_queue_worker in detailed examples
work_queue: add find_executable function and use it to find gzip

This allows the example to work on Ubuntu where gzip is in /bin rather than
/usr/bin.
Merge pull request #347 from pbui/ubuntu-fixes

Ubuntu fixes for wq.