Uwosh-snippets

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- Handle missing objects when pages with
snippets have been deleted
[cdw9]

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- add note about rendering snippets inline
[tkimnguyen]

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- more step by step user documentation
[tkimnguyen]

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- enhance user doc in README
[tkimnguyen]

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- fix MANIFEST to include missing marker file to enable creation of
.snippets folder on activation
[tkimnguyen]

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- Add site setup configuration
[vangheem]

- Integrate link integrity
[vangheem]

- Be able to add any content for a snippet
[vangheem]

- Use lxml to parse doc
[vangheem]