Docs

[prisae]

• Add command to install emg3d with all optional dependencies.
• Remove NumPy from install_requires in setup.py (handled through SciPy).

[coveralls]

Pull Request Test Coverage Report for Build 1853411314

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.856%

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Totals
Change from base Build 1818538788:	0.0%
Covered Lines:	4162
Relevant Lines:	4168

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💛 - Coveralls