Merge branch 'ruby2.1' into 'master'

Ruby2.1

To support GitLab we need current Ruby oldstable, which is Ruby 2.1.6.

Rationale: https://gitlab.com/gitlab-org/gitlab-ce/commit/757df0142f521380b92d28a721a7fd2bd8aa382f

/cc @kazuhiko

See merge request !5

component/ruby/buildout.cfg

@@ -12,10 +12,8 @@ extends =
 
 parts = ruby
 
-[ruby-2.2]
+[ruby-common]
 recipe = slapos.recipe.cmmi
-url = http://ftp.ruby-lang.org/pub/ruby/2.2/ruby-2.2.2.tar.xz
-md5sum = dbce9b9d79d90f213ba8d448b0b6ed86
 configure-options =
   --enable-shared --enable-rpath --disable-install-doc
   --with-out-ext=tk,tk/tkutil,win32,win32ole
@@ -25,5 +23,18 @@ environment =
   LDFLAGS=-L${gdbm:location}/lib -L${libffi:location}/lib -L${libyaml:location}/lib -L${ncurses:location}/lib -L${openssl:location}/lib -L${readline:location}/lib -L${zlib:location}/lib -Wl,-rpath=${gdbm:location}/lib  -Wl,-rpath=${libffi:location}/lib -Wl,-rpath=${libyaml:location}/lib -Wl,-rpath=${ncurses:location}/lib -Wl,-rpath=${openssl:location}/lib -Wl,-rpath=${readline:location}/lib -Wl,-rpath=${zlib:location}/lib
   PKG_CONFIG_PATH=${libyaml:location}/lib/
 
+
+[ruby2.1]
+<= ruby-common
+url = http://ftp.ruby-lang.org/pub/ruby/2.1/ruby-2.1.6.tar.xz
+md5sum = ec6f10ca331ce947802ede86259513a8
+
+
+[ruby2.2]
+<= ruby-common
+url = http://ftp.ruby-lang.org/pub/ruby/2.2/ruby-2.2.2.tar.xz
+md5sum = dbce9b9d79d90f213ba8d448b0b6ed86
+
+
 [ruby]
-<= ruby-2.2
+<= ruby2.2