doc: "RubyGems" is the correct capitalization

So says the project website and documentation

GNUmakefile

@@ -1,4 +1,4 @@
-# use GNU Make to run tests in parallel, and without depending on Rubygems
+# use GNU Make to run tests in parallel, and without depending on RubyGems
 all:: test
 ruby = ruby
 rake = rake

HACKING

@@ -14,14 +14,14 @@ done.
 
 Tests are good, but slow tests make development slow, so we make tests
 faster (in parallel) with GNU make (instead of Rake) and avoiding
-Rubygems.
+RubyGems.
 
 Users of GNU-based systems (such as GNU/Linux) usually have GNU make installed
 as "make" instead of "gmake".
 
 Since we don't load RubyGems by default, loading Rack properly requires
 setting up RUBYLIB to point to where Rack is located.  Not loading
-Rubygems drastically lowers the time to run the full test suite.  You
+RubyGems drastically lowers the time to run the full test suite.  You
 may setup a "local.mk" file in the top-level working directory to setup
 your RUBYLIB and any other environment variables.  A "local.mk.sample"
 file is provided for reference.

README

@@ -78,7 +78,7 @@ and run setup.rb after unpacking it:
 
 http://rubyforge.org/frs/?group_id=1306
 
-You may also install it via Rubygems on Gemcutter:
+You may also install it via RubyGems on Gemcutter:
 
   gem install unicorn
 

unicorn.gemspec

@@ -49,5 +49,5 @@ Gem::Specification.new do |s|
   # *strongly* recommended for security reasons.
   s.add_dependency(%q<rack>)
 
-  # s.licenses = %w(GPLv2 Ruby) # licenses= method is not in older Rubygems
+  # s.licenses = %w(GPLv2 Ruby) # licenses= method is not in older RubyGems
 end