Merge branch '72-bounding-boxes-not-working-after-project-creation' into 'master'

Resolve "bounding boxes not working after project creation"

Closes #72

See merge request troebs/pycs!67

pycs/projects/MediaFile.py

@@ -59,7 +59,7 @@ class MediaFile(ObservableDict):
 
     def resize(self, maximum_width):
         # check if resized file already exists
-        resized = MediaFile(self, self.project_id)
+        resized = MediaFile(self.copy(), self.project_id)
         resized['id'] = self['id'] + '-' + maximum_width
 
         target_directory, target_name = self.__get_file(resized['id'])