Feature Request: Routing of mathematical queries to WolfRamAlpha

[Dizzy611]

This should look for signs that a question is mathematical in nature, such as the usage of common variable names (x, y, z, theta, r), operators (=, +, *, /, etc) words that can sub for operands (what is 4 divided by 2, etc) and pass any such queries to wolfram|alpha, returning a summary of the first result.

As wr|a queries can take a while, maybe have an initial response of "Please wait..." before actually returning the query response.

[Dizzy611]

An example query and response:

[11:50] User: @birdbot What is the derivative of x^2(sin(x)?
[11:50] BOTbirdbot: @user: Please wait...
[11:50] BOTbirdbot: @user: WolfRam|Alpha says that the derivative of x^2(sin(x) is x(2sin(x)+xcos(x)).