Fixed python::virtualenv

* added ${pip_cmd} install --upgrade pip to have a recent pip version installed, the python::virtualenv function failed with pip 1.4.1
* replaced --no-use-wheel with --no-binary :all: as a dependency of recent pip version

manifests/virtualenv.pp

@@ -159,7 +159,7 @@
     $pip_cmd = "${python::exec_prefix}${venv_dir}/bin/pip"
 
     exec { "python_virtualenv_${venv_dir}":
-      command     => "true ${proxy_command} && ${virtualenv_cmd} ${system_pkgs_flag} -p ${python} ${venv_dir} && ${pip_cmd} wheel --help > /dev/null 2>&1 && { ${pip_cmd} wheel --version > /dev/null 2>&1 || wheel_support_flag='--no-use-wheel'; } ; { ${pip_cmd} --log ${venv_dir}/pip.log install ${pypi_index} ${proxy_flag} \$wheel_support_flag --upgrade pip ${distribute_pkg} || ${pip_cmd} --log ${venv_dir}/pip.log install ${pypi_index} ${proxy_flag}  --upgrade pip ${distribute_pkg} ;}",
+      command     => "true ${proxy_command} && ${virtualenv_cmd} ${system_pkgs_flag} -p ${python} ${venv_dir} && ${pip_cmd} install --upgrade pip && ${pip_cmd} wheel --help > /dev/null 2>&1 && { ${pip_cmd} wheel --version > /dev/null 2>&1 || wheel_support_flag='--no-binary :all:'; } ; { ${pip_cmd} --log ${venv_dir}/pip.log install ${pypi_index} ${proxy_flag} \$wheel_support_flag --upgrade pip ${distribute_pkg} || ${pip_cmd} --log ${venv_dir}/pip.log install ${pypi_index} ${proxy_flag}  --upgrade pip ${distribute_pkg} ;}",
       user        => $owner,
       creates     => "${venv_dir}/bin/activate",
       path        => $path,
@@ -171,7 +171,7 @@
 
     if $requirements {
       exec { "python_requirements_initial_install_${requirements}_${venv_dir}":
-        command     => "${pip_cmd} wheel --help > /dev/null 2>&1 && { ${pip_cmd} wheel --version > /dev/null 2>&1 || wheel_support_flag='--no-use-wheel'; } ; ${pip_cmd} --log ${venv_dir}/pip.log install ${pypi_index} ${proxy_flag} \$wheel_support_flag -r ${requirements} ${extra_pip_args}",
+        command     => "${pip_cmd} wheel --help > /dev/null 2>&1 && { ${pip_cmd} wheel --version > /dev/null 2>&1 || wheel_support_flag='--no-binary :all:'; } ; ${pip_cmd} --log ${venv_dir}/pip.log install ${pypi_index} ${proxy_flag} \$wheel_support_flag -r ${requirements} ${extra_pip_args}",
         refreshonly => true,
         timeout     => $timeout,
         user        => $owner,