[Commotion-admin] [luci-commotion-apps] added input validation and sanitizing for mitigating RCE vulnerabilities (#21)

[dismantl]

second commit should fix https://github.com/opentechinstitute/luci-commotion-apps/issues/12

to test, submit app with url: `javascript://127.0.0.1/?%0d%0aalert(document.domain)`. App submission should be rejected.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/luci-commotion-apps/pull/21#issuecomment-26603018
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