Auto merge of servo#68 - nnethercote:rm-heapsize, r=mbrubeck

Remove `heapsize` dependency.

The heapsize crate is being deprecated in favour of the malloc_size_of
crate within Servo.

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Auto merge of servo#66 - mbrubeck:bump, r=emilio

Version 0.4.4

* Add `as_slice` and `as_mut_slice` methods (servo#65).
* Add `with_capacity` constructor (servo#63).

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Auto merge of servo#60 - Xaeroxe:patch-1, r=jdm

Publish new version

It would be helpful to me to put the new `retain()` function on cargo.  Do you mind publishing a new minor version?

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Auto merge of servo#58 - mbrubeck:bump, r=jdm

Release version 0.4.2.

* Add `SmallVec::from_buf` constructor (servo#56).
* Add optional `serde` (de-)serialization support (servo#57).

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Auto merge of servo#53 - mbrubeck:no_std, r=emilio

Document and test no_std support

This builds on the new "std" Cargo feature added in servo#49.

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Auto merge of servo#50 - rphmeier:bump-heapsize, r=jdm

bump heapsize to 0.4.0

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Auto merge of servo#43 - mbrubeck:uninit, r=jdm

Don't zero the array on initialization

Using `mem::uninitialized` is potentially faster than `mem::zeroed`, and doesn't remove any safety (since both uninitialized memory and zeroed memory are unsafe to read from in general).

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Auto merge of servo#40 - mbrubeck:docs, r=Ms2ger

Docs, code cleanup, and misc. fixes for smallvec

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Bump to 0.2.0