Merge pull request #3 from jandog8990/master

Filter changes
paths changed to asluser default for ASL VHOST
multithreading exception handling changes. child processes hanging for subprocess.Popen([]). Added thread exception return functionality to give control to the parent. It should be noted that in parallelcwbQuery() the pool.join() and close() methods are switched for testing purposes.
multithreading error handling and subprocess changes
mulithreading error handling now tracks/kills child processes (subprocess children), improvement of exception outputs (traceback errors), timeout exceptions have been added for subprocess commands
y-axis labels and hourly tick marks have been fixed
HeliPlot now creates thumbnails, titles/labels have been fixed, vertical scaling range has been changed for more accurate trace spacing
Merge pull request #8 from agonzales-usgs/master

Latest changes from asluser@136.177.*.*