Remove unnecessary file.

https://code.google.com/p/esprima/issues/detail?id=14
https://code.google.com/p/esprima/issues/detail?id=424
Attach every comment to the possible previous syntax node.

The comment is placed in the trailingComments array of the said node.
This is based on the original patch from Yusuke Suzuki.

https://code.google.com/p/esprima/issues/detail?id=197
Fix the attachment of comments.

Both the proximity and the size of each syntax node need to be taken
into account when deciding which comment must be attached.

https://code.google.com/p/esprima/issues/detail?id=197