bug 995390 - make bing/yahoo codes consistent across channels, r=gavin

--HG--
extra : rebase_source : 0b8711d655edf1ecf45776fdff1edfa421da1403
Bug 998071 - implement test coverage for Yahoo search plugin, r=adw

--HG--
extra : rebase_source : cdec24b11e5c6383a14e9e7ab2dc8d59c3e0d2b2
Bug 999851 - remove topN support from search service, r=gavin

--HG--
extra : rebase_source : 4bce31c2fb6e078aa14ba31a3d06185f884f9ac1
Bug 1002777 - eBay search URLs are changing, r=adw

--HG--
extra : rebase_source : fa4edde15077b13ed9b9f75e1d8b5b065fd28390
Bug 998072 - implement test coverage for eBay search plugin, r=adw

--HG--
extra : rebase_source : f58a7320e1c5507a6bb42f2d94f3992e17cd574d
Bug 998073 - implement test coverage for Amazon search plugin, r=adw

--HG--
extra : rebase_source : d238b146692d6e7e6bd3c201471b545b04faa5ee
Bug 1001566 - Yahoo search plugin should use nresults param for smaller requests, r=margaret

--HG--
extra : rebase_source : 0cf539a02c5b19a51dd8e9cfbe13f4e07759fbe8