Update No Ref Siblings to Use Rolodex

[califlower]

Note: This is my first contribution, so if you want something a particular way please let me know! I tried to keep everything as consistent as possible between the changes

1. Updates the No Ref Siblings component to use the Rolodex in order to properly traverse all referenced files.
2. Adds in the origin field to the rule result otherwise it wasn't possible to get the file in which the rule was used in. I used idx.FindNodeOrigin(val) instead of idx.FindNode(key) because using the key returned nil each time.

I can add a test for this if needed, but I wasn't sure how to test the No Ref Siblings rule for multiple files.

Fixes:

• Issue where no-ref-siblings would not traverse references files
• issue no-$ref-siblings does not use rolodex #546

[daveshanley]

This is good! thank you for fixing this.