[command] Make the changelog command work again.

lib/motion/project/command.rb

@@ -40,6 +40,17 @@ module Motion; module Project
       help! message
     end
 
+    # This is lifted straight from CLAide, but adjusted slightly because the
+    # Class#name method is overriden in the old (deprecated) API below.
+    def self.command
+      @command ||= __name__.split('::').last.gsub(/[A-Z]+[a-z]*/) do |part|
+        part.downcase << '-'
+      end[0..-2]
+    end
+    class << self
+      alias_method :__name__, :name
+    end
+
     def self.name
       warn "The usage of `Motion::Project::Command.name` is deprecated use the " \
            "`Motion::Project::Command.command` method instead. " \
@@ -54,7 +65,6 @@ module Motion; module Project
       self.command = name
     end
 
-
     def self.help
       warn "The usage of `Motion::Project::Command.help` is deprecated use the " \
            "`Motion::Project::Command.summary` method instead. " \

lib/motion/project/command/changelog.rb

@@ -22,15 +22,12 @@
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 module Motion; module Project
-  class ChangelogCommand < Command
-    self.name = 'changelog'
-    self.help = 'View the changelog'
-
-    def run(args)
-      unless args.empty?
-        die "Usage: motion changelog"
-      end
+  class Changelog < Command
+    self.summary = 'View the changelog.'
+    self.description = 'View the changes that have been made in all ' \
+                       'RubyMotion versions.'
 
+    def run
       pager = (ENV['PAGER'] or '/usr/bin/less')
       system("#{pager} /Library/RubyMotion/NEWS")
     end