Depends on PHP = 1.1.8

https://github.com/inviqa/chef-php-extra/blob/master/metadata.rb
Has the following dependencies:

```
depends "git", ">= 1.0.0"
depends "yum", ">= 0.8.0"
depends "apt", ">= 1.8.4"
depends "php", "= 1.1.8"
```

I think it should be: 

```
depends "php", ">= 1.1.8"
```

With the old 1.1.8 chef librarian leads to unresolvable deps
