fixed some bugs in gist-method command and gave it a dependency on

'gist' gem. Added `.<shell command>` descriptive command (cannot be
executed). Fixed tests.

lib/pry/commands.rb

@@ -23,6 +23,9 @@ class Pry
       Pry.start(target)
     end
 
+    command ".<shell command>", "All text following a '.' is forwarded to the shell." do
+    end
+
     command "exit-program", "End the current program. Aliases: quit-program, !!!" do
       exit
     end
@@ -34,15 +37,15 @@ class Pry
       run target, ".ri", *args
     end
 
-    command "gist-method", "" do |*args|
+    command "gist-method", "Gist a method to github.", :requires_gem => "gist" do |*args|
       options = { }
       meth_name = nil
       
       OptionParser.new do |opts|
-        opts.banner = %{Usage: show-command [OPTIONS] [CMD]
+        opts.banner = %{Usage: gist-method [OPTIONS] [METH]
 Gist the method (doc or source) to github.
 e.g: gist -m my_method
-e.g gist -d my_method
+e.g: gist -d my_method
 --
 }
         opts.on("-m", "--method", "Gist a method's source.") do |line|
@@ -61,6 +64,8 @@ e.g gist -d my_method
         meth_name = v
       end
 
+      next if options[:h]
+
       meth_name = meth_name_from_binding(target) if !meth_name
 
       if (meth = get_method_object(meth_name, target, options)).nil?

test/test.rb

@@ -434,8 +434,9 @@ describe Pry do
               end
             end
 
-            Command2.commands.keys.size.should == 2
+            Command2.commands.keys.size.should == 3
             Command2.commands.keys.include?("help").should == true
+            Command2.commands.keys.include?("install").should == true
             Command2.commands.keys.include?("h").should == true
 
             Object.remove_const(:Command2)