Add a wget installer which downloads file from web.#207

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weakish wants to merge 3 commits intosprinkle-tool:masterfrom

Commits on May 3, 2016

Add a wget installer which downloads file from web.
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Commits on Jul 10, 2016

wget: resume downloading (`-c`).
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Commits on Jul 11, 2016

wget: fix indent and typo.
weakish
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