Update ruby-magic-static to v0.3.1

This switches the download mirror to an HTTPS site and fixes the
static-analysis home page issue.

Gemfile.lock

@@ -1109,7 +1109,7 @@ GEM
       i18n
     ruby-fogbugz (0.2.1)
       crack (~> 0.4)
-    ruby-magic-static (0.3.0)
+    ruby-magic-static (0.3.1)
     ruby-prof (1.3.1)
     ruby-progressbar (1.11.0)
     ruby-saml (1.7.2)