Add funct to remove small connected compononents
Add examples to docstring
Add tests for remove_small_connected_components
Modify example to use remove_small_connected_components
Improve docstring for remove_small_connected_components

- Explain behavior if input is of int type.
- Add `Raises` section for possible errors.
- Remove explicit numpy import from example.
Rename function to remove_small_objects
Add raise and labeled image tests
Fix missed rename in example
Add specific error messages and exceptions
Merge pull request #446 from jni/morphology-functions

Morphology functions