Christoffer Lindahl Hassel

Throw exception on invalid expression instead of giving PHP error

4

When `math_eval()` is given an invalid math expression, the `MathParser` package returns a `null` AST. This PR changes the behaviour by throwing an `InvalidExpression` exception instead which make it catchable.

Remove Guzzle as dependency

7

The usage of the Guzzle lib inside this library was minimal, only used for URI parsing. Since I don't use Guzzle in my own projects, I thought it could be...