Initialize a crate for memory related tools#89

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cheme merged 25 commits intoparitytech:masterfrom

cheme:mem-tools2

Jan 16, 2019

Commits on Dec 6, 2018

Mem tools by including trait and specific implementation in the crate
cheme
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Commits on Dec 7, 2018

Commits on Dec 10, 2018

Commits on Dec 11, 2018

Commits on Jan 2, 2019

Commits on Jan 7, 2019

use cfg_if to makes feature choice more explicit.
cheme
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Commits on Jan 10, 2019

Commits on Jan 12, 2019

Use malloc_size_of_derive from crates.
cheme
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