Making 'get' and 'post' methods more intuitive

[exos]

Sorry my english, this is a small commit. Actualy you need start with "/" and apply the ".json" extension in methods get/post's urls.

This does not intuitive:

get('/users/show.json',{screen_name: 'exos'}, function (err, res) {
    ...
});

instead of presume a url not begun by "/" is a complete URL, I presumed opposite:

get('users/show',{screen_name: 'exos'}, function (err, res) {
    ...
});

In my version is correct, and translate to https://api.twitter.com/1.1//users/show.json?screen_name=exos

For compatibility the follows urls are accepted:

• 'users/show'
• '/users/show'
• 'users/show.json'
• '/users/show.json'

But, if an url start with http://, https://, somestring:// the url has considerate absolute. Ex 'http://anotherhost.com/users/show.nojson' is'nt translate.

[exos]

It considers any protocol, you can replace this by:

if (!url.match(/^https?:\/\//i)) {