Fixed #415 Non-Admin profile can access Dashboard

In site.js, in pagebeforeshow, added logic for when the current user is
not an administrator, if the page is the dashboard, to redirect to
index.html
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Merge pull request #441 from gcw07/patch-1

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Added my name to Contributors
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Merge pull request #444 from shivaram1190/master

Contributors.md
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Merge pull request #447 from CWatkinsNash/master

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Merge pull request #448 from Logos302/master

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Merge pull request #450 from TheWorkz/master

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