change the APP_CHECK_LIMIT

[davidstack]

the default stageing timeout is 900, the APP_CHECK_LIMIT need to be 900,
because when we push app using cf, our stageing process is slow,it always send "staged failed" message.

[cfdreddbot]

Hey davidstack!

Thanks for submitting this pull request!

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[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this. You can view the current status of your issue at: http://www.pivotaltracker.com/story/show/67809042

[karlkfi]

This project is deprecated in favor of the go cli.

@scottruitt What are we doing with PRs here?

CF Community Pair (@karlkfi & @jfmyers9)

[scottruitt]

This repo will move to the attic in one week's time. We're no longer actively developing it. It's up to you, @karlkfi and @jfmyers9, if you want to merge this PR.