Added name and description to give action

The new syntax of the action is:
```
give <item id|item id:damage value> <amount> [item meta...]
```

where `item meta` can be one or more of the following:
```
<enchantment id>:<enchantment level>
name:<item name>
lore:<Item description>
```

For `name` and `description`, you can use an underscore `_` to create a space. For `description` only, you can use a pipe `|` to create a new line. You can also use the `&<color id>` syntax to color a meta information.

This should close issue #50.