Rename WReq to Wreq for sanity

--HG--
rename : Network/WReq.hs => Network/Wreq.hs
rename : Network/WReq/Internal.hs => Network/Wreq/Internal.hs
rename : Network/WReq/Internal/Lens.hs => Network/Wreq/Internal/Lens.hs
rename : Network/WReq/Internal/Link.hs => Network/Wreq/Internal/Link.hs
rename : Network/WReq/Internal/Types.hs => Network/Wreq/Internal/Types.hs
rename : Network/WReq/Lens.hs => Network/Wreq/Lens.hs
rename : Network/WReq/Lens/Machinery.hs => Network/Wreq/Lens/Machinery.hs
rename : Network/WReq/Lens/TH.hs => Network/Wreq/Lens/TH.hs
rename : Network/WReq/Session.hs => Network/Wreq/Session.hs
rename : Network/WReq/Types.hs => Network/Wreq/Types.hs