not raising the original exception, as we will print it out before we ask about their logs
printing exception before asking about collecting logs, and fixed tests accordingly
catching control-c on run-instances, so that it doesn't print out an extra stack trace
only gathering logs if run-instances fails
added initial call to collect logs
added logs command, to provide a wrapper around appscale-gather-logs
added logs directive to executable
fixed appscale executable to check arg length correctly
refactored gather-logs to return success as a boolean
Merge pull request #87 from shatterednirvana/reduced-log-gathering

Reduced amount of log gathering
Merge pull request #88 from shatterednirvana/appscalefile-get-logs

Add 'logs' command to AppScalefile