Fix function_matches to see "Packages/User" directory

I'm using ST2.

When I put foo.py in my "Packages/User" directory, the function defined in the file is not be called.

This is my `Packages/User/ApplySyntax.sublime-settings`
```
{
    // If you want exceptions reraised so you can see them in the console, change this to true.
    "reraise_exceptions": false,

    // If you want to have a syntax applied when new files are created, set new_file_syntax to the name of the syntax to use.
    // The format is exactly the same as "name" in the rules below. For example, if you want to have a new file use
    // JavaScript syntax, set new_file_syntax to 'JavaScript'.
    "new_file_syntax": false,

    // Put your custom syntax rules here:
    "syntaxes": [
    {
      "name": "RubyMotion",
      "rules": [
        {"function": {"name": "is_rubymotion_file"}}
      ]
    }
    ]
}
```

and `Packages/User/is_rubymotion_file.py`
```
import os.path
import re


def is_rubymotion_file(file_name):
    path = os.path.dirname(file_name)
    file_name = os.path.basename(file_name).lower()
    name, extension = os.path.splitext(file_name)

    result = False
    re_rubymotion = re.compile("Motion::Project::App")

    while path != "/":
        rakefile = os.path.join(path, "Rakefile")
        if os.path.exists(rakefile):
            for line in open(rakefile):
                if re_rubymotion.search(line):
                    result = True
                    break
        path = os.path.dirname(path)

    return extension == ".rb" and result

```