Updated documentation for gem versions feature and made some improvements to

this feature.

README.rst

@@ -20,6 +20,7 @@ Usage
     recipe = rubygemsrecipe
     gems =
         sass
+        compass==0.10
 
 After running buildout you can use SASS from buildout environment::
 
@@ -29,7 +30,8 @@ Options
 =======
 
 gems
-    list of gem package names.
+    list of gem package names, also you can specify gem version, example:
+    ``sass==3.1.1``.
 
 version
     rubygems version, if not specified, recipe will try to find most recent

rubygems.py

@@ -162,7 +162,6 @@ class Recipe(object):
             self._install_rubygems()
             gem_executable = self.get_gem_executable(bindir)
 
-        for gem in self.gems:
         s = {
             'GEM': gem_executable,
             'OPTIONS': ' '.join([
@@ -170,13 +169,16 @@ class Recipe(object):
                     '--no-ri',
                     '--bindir=%s' % bindir,
                 ]),
-                'GEMNAME': gem
         }
-            if '=' in gem:
-                gemname, version = (gem.strip() for gem in gem.split('='))
+        for gemname in self.gems:
+            if '==' in gemname:
+                gemname, version = gemname.split('==', 1)
+                s['GEMNAME'] = gemname.strip()
+                s['OPTIONS'] += ' --version %s' % version.strip()
+            else:
                 s['GEMNAME'] = gemname
-                s['OPTIONS'] += ' --version %s' % version
-            self.run('%(GEM)s install %(OPTIONS)s %(GEMNAME)s' % s, self._get_env())
+            self.run('%(GEM)s install %(OPTIONS)s %(GEMNAME)s' % s,
+                     self._get_env())
 
         for executable in os.listdir(bindir):
             installed_path = self._install_executable(