Merge pull request #22 from sisl/warm_start

added warmstart option for sparseadjmatrix milp

Merge pull request #21 from sisl/develop

version bump

jupyternotebook test only if not CI

white space changes

Updated get_env_state test to catch wrong # objs

Change get_env_state back to older version

formatting change

removed unused type variables

package updates

Merge 'origin/master' into develop

added Project.toml for new Graphs package

modified README.md

modifed README.md