[#40] Allow SSHKit.run executing on hosts in parallel#131

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seungjin wants to merge 6 commits intobitcrowd:mainfrom

seungjin:master

Commits on Aug 27, 2018

Allowing executing on hosts asynchronously.
seungjin
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Commits on Aug 30, 2018

Commits on Aug 31, 2018

No trailing white-space at the end of a line.
seungjin
committed

Commits on Sep 3, 2018

test for parallel SSHKit.run execution with :parallel option
seungjin
committed
Parallel run test's threshold changed for some slower environment.
seungjin
committed