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add PI doco
Update Plugins.md

small typo
Update Index.md
English editing
Update building-nservicebus-from-source-files.md
Update hosting-nservicebus-in-windows-azure-cloud-services.md
fix azure links
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More edits to Saga doc on servicematrix
SM Customizing Article
SM Customizing extending

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Updating TOC in SM Customization
First draft of ServiceMatrix customization

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Merge pull request #284 from jdrat2000/ServiceMatrix-Saga-Doco

ServiceMatrix Extending and Customizing