Merge pull request #197 from zarstensen/dev

bump version to 1.4.1 (#196)

added \ohm as a valid symbol (#193)

add negative lookahead to '\va' terminal (#194)

configure sympy parameter exp_is_pow to true globally (#195)

Merge pull request #182 from zarstensen/dev

bump version to 1.4.0 (#188)

change in to for, and await mathjax load (#187)

Unit aliases (#186)

change in to for, and await mathjax load

Refactor plugin codebase into MVC design pattern (#185)

Add python socks as a dependency (#184)

fix not being able to undefine default definitions (#183)

Add physics package (#181)

add vector cross product (#180)