Fix comment parsing with unattached comments

[Shane32]

Fixes #80

• Fixes an issue where trailing comments throw an exception
• Fixes an issue where comments can be applied to an incorrect node
• Unattached comments are returned in a list attached to the document

Note: these two documents parse the same, with the comment applied to obj2

{
  obj1 {
    field1
    # comment
  }
  obj2 {
    field2
  }
}

and

{
  obj1 {
    field1
  }
  # comment
  obj2 {
    field2
  }
}

[Shane32]

I have no idea why VS automatically reformatted the document. Please use GitHub's "hide whitespace changes" feature to make the diff readable.

[sungam3r]

@Shane32 Thanks. I am now looking at this simple and obvious solution and do not understand why I decided to throw an exception before.

[sungam3r]

I posted #106 to prevent unexpected changes.

[sungam3r]

I don't understand what happened to the formatting. Apparently, now it is correct. Anyway, looks good.