improved imports to declutter base namespace

module namespaces are still clogged with things like `os` -- for example, `mc.canvas_objects.os`.  The `os` there shouldn't make it out.  But I'm running out of time to work on this.

markdown2canvas/__init__.py

@@ -36,27 +36,30 @@
 
 __version__ = '0.'
 __author__ = 'silviana amethyst, Mckenzie West, Allison Beemer'
-__all__ = ['logging','exception','translation_functions','canvas2markdown','tool']
+__all__ = ['logging','exception','translation_functions','course_interaction_functions',
+           'CanvasObject', 'Document', 'Page', 'Assignment', 'Image', 'File', 'BareFile', 'Link',
+           'canvas2markdown','tool']
 
-import markdown2canvas.logging
 
-import markdown2canvas.exception
+import markdown2canvas.logging as logging
 
-from .setup_functions import *
+import markdown2canvas.exception as exception
 
+from .setup_functions import get_canvas_key_url, make_canvas_api_obj
 
-import markdown2canvas.translation_functions
 
-from .course_interaction_functions import *
+import markdown2canvas.translation_functions as translation_functions
+
+import markdown2canvas.course_interaction_functions as course_interaction_functions
 
 ################## classes
 
 from .canvas_objects import CanvasObject, Document, Page, Assignment, Image, File, BareFile, Link
 
 
-import markdown2canvas.canvas2markdown
+import markdown2canvas.canvas2markdown as canvas2markdown
 
-import markdown2canvas.tool
+import markdown2canvas.tool as tool