Foyer 0.8.1

Features

• Add SMARTS definition for esters in oplsaa.xml (#346)
• Add SMARTS definition for lithium ion in oplsaa.xml (#383)
• Add lj14scale and coulomb14scale to Forcefield (#398)
• Add SMARTS definition for chloride ion in oplsaa.xml (#403)
• Add SMARTS definition for acetate ion in oplsaa.xml (#404)

Maintenance

• Refactor the creation of a structure from a residue (#373)
• Default to environment.yml files for environment creation (#400)
• Include pytest.ini for sane pytest defaults (#400)
• Make environment.yml files more consistent among the mosdef-hub organization (#410)
• Fix regression in Dockerfile and automated image building (#412)
• Add link and blurb about the TRUE paper and methodology (#413)
• Pin networkx dependency to >=2.5 (#416)
• Add Units tab to our documentation at foyer.mosdef.org (#402)