update leftmenu to work with react router 4#8

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adrianke77 wants to merge 10 commits intomasterfrom

adrian/leftmenu

Commits on Jun 2, 2017

Clarification in README
adrianke77
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fix leftmenu with dropdown
adrianke77
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testing fix for leftmenu href jumping

Altitude Labs
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adrianke77
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changed logo to css
adrianke77
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fix logo code
adrianke77
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fix logo code
adrianke77
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Fixed header image

v2arunv
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adrianke77
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Fixed conflicts

v2arunv
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adrianke77
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highlight active link
adrianke77
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Commits on Jun 6, 2017

modified to work with react router 4
adrianke77
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