Add cluster support (custom types)#2

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calvinmetcalf wants to merge 6 commits intomasterfrom

Commits on May 18, 2016

add custom type
calvinmetcalf
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Commits on May 19, 2016

Add cluster data if present
Ilya Radchenko
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Add example cluster ruleset
Ilya Radchenko
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Document markerCluster type
Ilya Radchenko
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Add cluster secondary marker data
Ilya Radchenko
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Commits on May 23, 2016

Update readme.md
Ilya Radchenko
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