[Statistics] Robustness against Pods with whitespace in the name

Author: fabiopelosin

lib/cocoapods-core/specification/set/statistics.rb

@@ -221,7 +221,7 @@ def compute_creation_date(set)
           date = get_value(set, :creation_date)
           unless date
             Dir.chdir(set.sources.first.repo) do
-              git_log   = `git log --first-parent --format=%ct #{set.name}`
+              git_log = `git log --first-parent --format=%ct "#{set.name}"`
               creation_date = git_log.split("\n").last.to_i
               date = Time.at(creation_date)
             end