v1.0.0rc3

Enhancements:
- Define an LP using any type of sequence (not just numpy array)
- Branch and bound visual now shows isoprofit lines.
- IP examples added to examples module.
- Pyhull dependency removed.
- Visualization functions test cases added. Coverage increased,
- Select a default visibility for update_sliders function.
- Added linting to CI

Bug fixes:
- Fathom by bound now fathoms nodes with objective <= to best bound not just <.
- Shift x properly in tree positioning function
- Wrong text colors used in the branch and bound nodes
- Fixed circleci badge in README
- Numerical issue in polytope_facets fixed
- Branch and bound iteration used wrong LP coefficents