[Commotion-admin] [commotion-apps] fixed port input validation to prevent code injection (#4)

[danstaples]

to test:

1. try submitting applications with the following values in the port field, and ensure it returns a validation error without opening up a reverse shell (test with "nc <ip address> 1337" and entering shell commands):

`nc -e /bin/sh -l -p 1337`
$(nc -e /bin/sh -l -p 1337)

2. try submitting applications with the following values in both the name and description fields. the application should be *accepted*, but without opening up a reverse shell:

`nc -e /bin/sh -l -p 1337`
$(nc -e /bin/sh -l -p 1337)

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/commotion-apps/pull/4#issuecomment-18433126
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