Upgrade from 0.5 to 0.6

Option

Option upchanges have been removed. Any price variations should be set using variations. The value property and corresponding methods have been changed to index

Before:
```
public function setValue($value);
public function getValue();
```
After:
```
public function setIndex($index);
public function getIndex();
```

OptionGroup

The name property and corredsponding methods have been changed to type to Option

Before:

public function setName($name);
public function getName();

After:

public function setType($type);
public function getType();