Array instantiation does not work with clean syntax

According to readme array can be instantiated like this:

http://pythonnet.github.io/readme.html

```
from System import Array
myarray = Array[int](10)
```

However this syntax stopped working and instead need to use one of two options:

```
list(Array.CreateInstance(int,10)) # [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
```

or

```
list(Array[int](range(10))) #[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
```
