Modified gem controller to support new gem.list file format (Fixes #61)

Made a small change to the gem controller so that the warnings that resulted from the merge of pull request #60 (which modified the gem.list file so that it might include fields on each line that indicate version limits for each gem) no longer occur.  The gem controller now takes the first field from each line as the gem name and ignores any extra fields that may appear in the gem.list file after that gem name.  This restores the previous behavior (even in cases where version limits are included for some gems in the list) and prevents the controller from attempting to install gems with names like ">=" and "1.7.7" (which resulted in warnings being thrown during the boot process)