Comment on GrowlCamino

Change log:
1.2: Adjust linking for compatibility with GrowlMail. 10.4+ only.
1.3beta: Add selector checks for robustness.
1.3beta2: Reduce fragility of myDidStartDownload
1.4: Identical to 1.3beta2
1.5beta: Compatibility update -- enable garbage collection, fix compatibility with GrowlSafari
1.6: Fix compatibility with garbage-collected applications and GrowlSafari

Strangely, after upgrading to 1.6, version is still displayed as 1.3beta in Finder.