Add clone_at2 and fetch2#731

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Commits on Jan 4, 2018

add remote fetch2 without GVL
yangxin
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Merge branch 'master' into remote_fetch_without_gvl
yangxin
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add remote clone_at2 without GVL
yangxin
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Fix wrong types of repo
yangxin
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Commits on Jan 11, 2018

Fix: git_cred has already included credtype
yangxin
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Commits on Jan 12, 2018

Fix double free bug
yangxin
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