Suggestions from Dominik

[schallerdavid]

Description

This PR fixes bugs and implements suggestions from Dominik.

Todos

Notable points that this PR has either accomplished or will accomplish.

• [x] Protein should raise an error if initialized with "toolkit=OpenEye" but without a valid OpenEye license (this leads to a dead kernel otherwise)
• [x] be more explicit on custom sequences, e.g. mutations, now integrated into object model notebook
• [x] render mathematical expressions in kinoml.core.measurements
• [x] updated online documentation including rendering of notebooks

Status

• [ ] Ready to go

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[codecov-commenter]

Codecov Report

Merging #118 (50fcb22) into master (e2a4bee) will decrease coverage by 0.33%. The diff coverage is 80.00%.