Fix GoogleParser first-child selector problem. #131
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For now, the GoogleParser can't parse results of files like these:
[PDF]david singer (LoA).pdf
home.sogang.ac.kr/.../david%20singer%20(LoA).pd...
In this case, since <span class="_ogd b w xsm">[PDF]</span> is the first child and <a href="..."> is the second child, the parser can't parse the link. However, w/o first-child works very well in both cases(file and non-file cases). I think this is somewhat redundant and should be removed.