post: add getBySlug() as an alias to getbyslug()
post: add getBySlug() as an alias to getbyslug()

I like camelCase :)

DNESS/wpcom.js,Automattic/wpcom.js,Automattic/wpcom.js,DNESS/wpcom.js,dnessorga/wpcom.js,dnessorga/wpcom.js