#238: removed spec/support/bin/curl

@tmeasday fix for #238 .

Passes all tests on Debian 7 in 4m. In fact, even if I replace its content with

```
#!/bin/sh
echo DO NOT USE THIS CURL
false
```

All tests are still passed. ~~Looks like it's completely unused if meteor is installed.~~ Except three last of them (invoking `meteor run` in a meteor project with a smart.json and the smart.json specifies a meteor fork pinned to a branch/tag/ref)