Need 1.9.3
Merge pull request #1 from bklang/master

Document need for 1.9.3
Auto-compile scenarios before running a test. fixes #3
Start begin block earlier to ensure we don't have excess ahn processes
Make the test fail if Adhearsion and/or SIPp fails
Reduce system calls and separate test running into a method
Give Watcher's @polling a more descriptive name (interval)
Change IO.read to File.read and guard against a nonexistent ahn pid
Rake tasks now check for an Adhearsion pid of 0