"truffle init" should check for existence of truffle.js before messing up with the current dir

[ghost]

• I've asked for help in the Truffle Gitter before filing this issue.

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Issue

"truffle init" will screw up your working directory

Steps to Reproduce

Have a working truffle workspace with a bunch of stuff in it.

Expected Behavior

"truffle init" does nothing, e.g., does not add MetaCoin.sol, and perhaps prompt you "The current directory already contains a truffle.js, skipping..."

Actual Results

Adds MetaCoin.sol to contracts and generally mess up your workspace

Environment

All

[tcoulter]

Added to truffle-init in v1.0.5. To enable, uninstall and reinstall Truffle, which will download the latest truffle-init dependency. Cheers!