Allow for multiple methods in METHOD call

[jeremydaly]

Was thinking that you could define a route for multiple methods using an array of methods in a METHOD call. For example, api.METHOD([ 'post', 'put' ], '/some/path', (req,res)=> {})

This would be similar to the idea of an any() convenience method, but would restrict the allowable methods.

[jeremydaly]

Implemented. I'm looking the methods here, but since most instances just have 1, there should be no performance impact.

[jimsorock]

Hi Jeremy, sorry for commenting on a closed issue, but does the typescript definition to support this just need to be updated?

PR here for typescript support: #152