cli self update

[tanner0101]

Allows the CLI to update itself.

If this is approved, I will remove the Homebrew support.

vapor self-update

Edit:

Also adds an option for OSX to generate and open Xcode projects.

vapor xcode

Fixes #217

[tanner0101]

@qutheory/contributors let me know if this looks good.

[p4t5h3]

We could avoid one redirect, if cli.qutheory.io redirects to GitHub via HTTPS directly.

Resolving cli.qutheory.io... 159.203.150.153
Connecting to cli.qutheory.io|159.203.150.153|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://raw.githubusercontent.com/qutheory/vapor/master/vapor [following]
--2016-05-07 19:54:00--  http://raw.githubusercontent.com/qutheory/vapor/master/vapor
Resolving raw.githubusercontent.com... 185.31.17.133
Connecting to raw.githubusercontent.com|185.31.17.133|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://raw.githubusercontent.com/qutheory/vapor/master/vapor [following]
--2016-05-07 19:54:00--  https://raw.githubusercontent.com/qutheory/vapor/master/vapor
Connecting to raw.githubusercontent.com|185.31.17.133|:443... connected.
HTTP request sent, awaiting response... 200 OK

Besides that, it looks good and works here.

[tanner0101]

Good idea. Changed it.