Avoid .unwrap()
Use arithmetic method name in message
Array: Fix bug with diagonal for Array<_, ()>

Zero-dimensional arrays should have length 1 diagonal.
Array: Edit docs
Array: Add operations Shl, Shr (shift left/right) and Not
Array: Add method .swap_axes()
Array: Add method x.assign(&y)
Array: Rename .at_sub() to .subview()
Array: Add methods .raw_data(), .raw_data_mut()
Array: Add method .is_standard_layout()
Array: Experimentally add support for Vec<Ix> as an Array shape
Array: move tests from lib.rs to tests/
Don't use izip!()
Move parse slice test to separate file
Array: Impl traits Eq, FromIterator, Hash
Array: Pass on format flags to each element's fmt
Array: Add methods .sum(), .mean(). Add functions arr0(), arr1(), arr2()