Cleaned up install instructions slightly.

python_examples/correlation_tracker.py

@@ -34,7 +34,7 @@
 #
 #   Also note that this example requires scikit-image which can be installed
 #   via the command:
-#       pip install -U scikit-image
+#       pip install scikit-image
 #   Or downloaded from http://scikit-image.org/download.html. 
 
 import os

python_examples/face_detector.py

@@ -39,7 +39,7 @@
 #
 #   Also note that this example requires scikit-image which can be installed
 #   via the command:
-#       pip install -U scikit-image
+#       pip install scikit-image
 #   Or downloaded from http://scikit-image.org/download.html. 
 
 import sys

python_examples/face_landmark_detection.py

@@ -39,7 +39,7 @@
 #
 #   Also note that this example requires scikit-image which can be installed
 #   via the command:
-#       pip install -U scikit-image
+#       pip install scikit-image
 #   Or downloaded from http://scikit-image.org/download.html. 
 
 import sys

python_examples/find_candidate_object_locations.py

@@ -33,7 +33,7 @@
 #
 #   Also note that this example requires scikit-image which can be installed
 #   via the command:
-#       pip install -U scikit-image
+#       pip install scikit-image
 #   Or downloaded from http://scikit-image.org/download.html. 
 
 

python_examples/train_object_detector.py

@@ -27,7 +27,7 @@
 #
 #   Also note that this example requires scikit-image which can be installed
 #   via the command:
-#       pip install -U scikit-image
+#       pip install scikit-image
 #   Or downloaded from http://scikit-image.org/download.html. 
 
 import os

python_examples/train_shape_predictor.py

@@ -35,7 +35,7 @@
 #
 #   Also note that this example requires scikit-image which can be installed
 #   via the command:
-#       pip install -U scikit-image
+#       pip install scikit-image
 #   Or downloaded from http://scikit-image.org/download.html. 
 
 import os