v0.5.1

GeophysicalFlows v0.5.1

Diff since v0.5.0

Merged pull requests:

• Various small fixes + Generalization of MultilayerQG.Problem() (#86) (@navidcy)
• Fix nbviewer/mybinder badges' urls in literated examples (#87) (@navidcy)
• Removes image tags and sm_75 from gitlab-ci.yml (#89) (@navidcy)