Refactored the BinaryFileEditView and ImageEditView to share more code
Fixed the image edit template to have a correct alt text on the img preview
Removed useless template variables in the image edit view
Re-organized the unit tests of the Image and BinaryFile edit views
Renamed FileBasedEditView to BinaryBaseEditView to match server side naming
Merge pull request #143 from ezsystems/binaryfile_vs_image

BinaryFileEditView and ImageEditView refactoring