Merge pull request PyPSA#447 from PyPSA/develop

v0.4.0 Release

Merge pull request PyPSA#406 from PyPSA/develop

v0.3.0 Candidate

v0.2.0: Merge pull request PyPSA#377 from PyPSA/develop

v0.2.0

Merge pull request PyPSA#294 from trevorb1/issue-220

Docs updates

Merge pull request PyPSA#210 from ktehranchi/master

Update Docs for Opts