npm / arborist / #630

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Rollback when a fatal signal arrives during reification

This also fixes an issue where the rollback did not properly restore the
state if installing a _new_ package, since there was no move required
when creating the sparse tree in that case, resulting in potentially
half-installed deps being left behind.  Found while combing through
testing every rollback for signal handling.

Fix: https://github.com/npm/cli/issues/2312

PR-URL: https://github.com/npm/arborist/pull/208
Credit: @isaacs
Close: #208
Reviewed-by: @ruyadorno, @wraithgar

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