Choko command

### How it works:
```
choko start
```
- If the file "./applications/applications.json" exist, will just start the application.
- If not, will create the default directory for applications (in case it not exist already), run the install process, and then start the server in order to continue the install process in the browser.

```
choko start sandbox
```
- If the file "./sandbox/applications.json" exist, will just start the application.
- If not, will create the specified directory for applications (in case it not exist already), run the install process, and then start the server in order to continue the install process in the browser.

So you could start a new application just doing:
```
$ mkdir my-project
$ cd my-project
$ choko start
$ tree
└── applications
    ├── applications.json
    └── localhost
        └── settings.json
```
Anything that helps to read and understand what the code does, can be a good practice. Blocks of code, are not fun to read, and even less to understand.
So, having said that, I think in this case doesn't the variable "server" have's everything in common, so looks like should be fine to get them together :)