fix(modal): Adds wildcard content selector
fix(modal): Adds wildcard content selector

Gives anyone the ability to specify content in the calling view instead of supplying a view/view-model pair.

moshensky/aurelia-bs-modal,atsu85/aurelia-bs-modal,atsu85/aurelia-bs-modal,moshensky/aurelia-bs-modal,PWKad/aurelia-bs-modal,sickboy/aurelia-bs-modal,PWKad/aurelia-bs-modal,sickboy/aurelia-bs-modal