Merge pull request #1406 from anntzer/plugins-relative-imports

Use relative imports to plugins.

skimage/io/_plugins/gtk_plugin.py

@@ -1,4 +1,4 @@
-from util import prepare_for_display, window_manager, GuiLockError
+from .util import prepare_for_display, window_manager, GuiLockError
 
 try:
     # we try to aquire the gui lock first

skimage/io/_plugins/q_color_mixer.py

@@ -2,7 +2,7 @@
 from PyQt4 import QtGui, QtCore
 from PyQt4.QtGui import (QWidget, QStackedWidget, QSlider, QGridLayout, QLabel)
 
-from util import ColorMixer
+from .util import ColorMixer
 
 
 class IntelligentSlider(QWidget):

skimage/io/_plugins/q_histogram.py

@@ -2,7 +2,7 @@ import numpy as np
 
 from PyQt4.QtGui import QWidget, QPainter, QGridLayout, QColor, QFrame
 
-from util import histograms
+from .util import histograms
 
 
 class ColorHistogram(QWidget):