Correctly build solr request parameters avoiding lists for rows

[marblestation]

• The previous method was creating lists inside the dictionary values such as:

{'__bigquerySource': [u'Library: bla'],
 '__qid': [u'9297b2910ea5d9f2fff6fcb042d4edbc'],
 'fl': u'title,abstract,comment,bibcode,author,keyword,id,citation_count,[citations],pub,aff,volume,pubdate,doi,pub_raw,page,links_data,property',
 'fq': [u'{!bitset}'],
 'hl': [u'true'],
 'hl.fl': [u'title,abstract,body,ack'],
 'hl.maxAnalyzedChars': [u'150000'],
 'hl.q': [u'*:*'],
 'hl.requireFieldMatch': [u'true'],
 'hl.usePhraseHighlighter': [u'true'],
 'q': [u'*:*'],
 'rows': [u'25'],
 'sort': [u'date desc, bibcode desc'],
 'start': [u'0'],
 'wt': 'json'}

And solr was not correctly interpreting the rows parameter, returning as many results as bibcodes were provided in the request data.

[coveralls]

Coverage decreased (-0.4%) to 96.259% when pulling f3d55b5 on marblestation:bibquery_rows_param_not_in_array3 into fc01766 on adsabs:master.