Coorect way to find gem executable, which can be named differently, depending on host system.

rubygems.py

 import errno
+import glob
 import hexagonit.recipe.download
 import logging
 import os
@@ -116,6 +117,8 @@ class Recipe(object):
             s = {
                 'OPTIONS': ' '.join([
                         '--prefix=%s' % self.options['location'],
+                        '--no-rdoc',
+                        '--no-ri',
                     ]),
             }
             self.run('ruby setup.rb all %(OPTIONS)s' % s, env)
@@ -137,15 +140,25 @@ class Recipe(object):
         os.chmod(executable, 0755)
         return executable
 
+    def get_gem_executable(self, bindir):
+        gem_executable = os.path.join(bindir, 'gem')
+        gem_executable = glob.glob(gem_executable + '*')
+
+        if gem_executable:
+            return gem_executable[0]
+
     def install(self):
         parts = [self.options['location']]
 
-        if not os.path.exists(self.options['location']):
+        bindir = os.path.join(self.options['location'], 'bin')
+        gem_executable = self.get_gem_executable(bindir)
+
+        if not gem_executable:
             self._install_rubygems()
+            gem_executable = self.get_gem_executable(bindir)
 
-        bindir = os.path.join(self.options['location'], 'bin')
         s = {
-            'GEM': os.path.join(bindir, 'gem1.8'),
+            'GEM': gem_executable,
             'OPTIONS': ' '.join([
                     '--no-rdoc',
                     '--no-ri',