Fix issue #48 : X and Y vectors can now be passed as pcolormesh argument (as in the original function)
Fix issue #53 : Labels are placed correctly when using log scale
Modified test_bar to add log test

Modified test_pcolormesh to add axes (X and Y) case
accept pcolormesh(X, Y, C) and xlim/ylim changes
accept changes
git push origin masterMerge branch 'Mrngilles-master'

* Mrngilles-master:
  accept changes
  Modified test_bar to add log test
  Fix issue #53 : Labels are placed correctly when using log scale
  Fix issue #48 : X and Y vectors can now be passed as pcolormesh argument (as in the original function)