v0.4.0

AllocArrays 0.4.0

Breaking

• reverts to the v0.2 way of doing things (see #20)
• in comparison to v0.2 adds no-op constructors so AllocArray(a::AllocArray) just returns a
  Diff since v0.3.0

Merged pull requests:

• rm UnsafeArrays, use previous way (#20)
• Breaking: always represent inner array as UnsafeArray (#18)

Closed issues:
None