fix ICA for old sklearn

mne/preprocessing/ica.py

@@ -589,6 +589,11 @@ def _fit(self, data, max_pca_components, fit_type):
         self.pca_mean_ = pca.mean_
         self.pca_components_ = pca.components_
         self.pca_explained_variance_ = exp_var = pca.explained_variance_
+        if not check_version('sklearn', '0.16'):
+            # unwhiten pca components and put scaling in unmixing matrix later.
+            # sklearn before 0.16 applied the whitening to the components
+            # but not the new PCA class.
+            self.pca_components_ *= np.sqrt(exp_var[:, None])
         del pca
         # update number of components
         self.n_components_ = sel.stop