Update to run with Tk kwargs branch

Once this is merged into master, the Tk kwargs branch should be merged
to master.
Fix Tk #26

This also adds a test for drawing directly to a canvas
Merge pull request #49 from timholy/master

Add more tests
Merge pull request #50 from timholy/Tkkwargs

Use keyword arguments in Tk interface
Merge pull request #51 from timholy/fixTk26

Fix Tk #26
make examples test work a bit more smoothly
update canvas3d
fix search for Winston.ini
use new draw and resize events
update for refactored and improved gtk backend 0.3.0
Merge pull request #36 from vtjnash/jn/gtk_refactor

Gtk v0.1.0 refactoring updates
fix gtk plot backend
Merge pull request #62 from vtjnash/jn/gtk_refactor

fix gtk plot backend
add needed Tk.draw call
remove extra display of p in return value of compose_plot
Merge pull request #63 from jverzani/patch-1

remove extra display of p in return value of compose_plot
Implement spy. Fix #59.
Fix memio warnings.
Fix imagesc for cases when min(img) == max(img)
Export spy
Add plothist. Fix #56.
webrepl is no longer in base, and no longer useful in Winston.