Fix typo.
Add call_callback() helper function to apply only the supported arguments to a callback call.
Update function references.
Add note about callback invocation.
Add functions that are in pydash but not LoDash.
Add thru().
Adjust wording.
Pylint.
Remove travis and sphinx specific requirements files.
Add serve-docs make target.
Add missing functions from __all__.
Fix tabs to spaces.
Fix function references.
Add "_" instance to pydash that supports method calling and method chaining.
Add Predicates section to API docs.
Add "_" instance to docs.