[3/7] _sympifyit -- fast decorator to _sympify(arg)
[3/7] _sympifyit -- fast decorator to _sympify(arg)

Now we've switched to `_sympifyit` in ArithMeths, __add__ does not accept
strings. As discussed in #247 we should use _sympy_ method instead to integrate
with SymPy say for SAGE.

This patch rewrites test_SAGE to just do that.

AunShiLord/sympy,Mitchkoens/sympy,drufat/sympy,Titan-C/sympy,Curious72/sympy,Sumith1896/sympy,ahhda/sympy,wyom/sympy,pbrady/sympy,kevalds51/sympy,skirpichev/omg,amitjamadagni/sympy,abloomston/sympy,pernici/sympy,beni55/sympy,emon10005/sympy,amitjamadagni/sympy,shikil/sympy,atreyv/sympy,madan96/sympy,moble/sympy,moble/sympy,jaimahajan1997/sympy,abhiii5459/sympy,ChristinaZografou/sympy,abloomston/sympy,mafiya69/sympy,asm666/sympy,iamutkarshtiwari/sympy,Curious72/sympy,ga7g08/sympy,jamesblunt/sympy,Curious72/sympy,cswiercz/sympy,kmacinnis/sympy,toolforger/sympy,Arafatk/sympy,moble/sympy,farhaanbukhsh/sympy,sahmed95/sympy,souravsingh/sympy,Shaswat27/sympy,wanglongqi/sympy,hargup/sympy,atsao72/sympy,cccfran/sympy,abloomston/sympy,wanglongqi/sympy,kmacinnis/sympy,Designist/sympy,emon10005/sympy,kumarkrishna/sympy,bukzor/sympy,pandeyadarsh/sympy,sahmed95/sympy,hazelnusse/sympy-old,minrk/sympy,wyom/sympy,grevutiu-gabriel/sympy,liangjiaxing/sympy,dqnykamp/sympy,chaffra/sympy,garvitr/sympy,AkademieOlympia/sympy,fperez/sympy,Designist/sympy,Sumith1896/sympy,kaushik94/sympy,drufat/sympy,sampadsaha5/sympy,yukoba/sympy,jamesblunt/sympy,wyom/sympy,sampadsaha5/sympy,mafiya69/sympy,hrashk/sympy,grevutiu-gabriel/sympy,AunShiLord/sympy,atreyv/sympy,farhaanbukhsh/sympy,jamesblunt/sympy,hrashk/sympy,lidavidm/sympy,garvitr/sympy,Vishluck/sympy,yashsharan/sympy,saurabhjn76/sympy,atsao72/sympy,kmacinnis/sympy,skidzo/sympy,Vishluck/sympy,hrashk/sympy,sahilshekhawat/sympy,shipci/sympy,VaibhavAgarwalVA/sympy,grevutiu-gabriel/sympy,jerli/sympy,Gadal/sympy,rahuldan/sympy,kaichogami/sympy,oliverlee/sympy,liangjiaxing/sympy,kumarkrishna/sympy,Mitchkoens/sympy,jerli/sympy,flacjacket/sympy,kevalds51/sympy,kaichogami/sympy,kaushik94/sympy,ga7g08/sympy,debugger22/sympy,ryanGT/sympy,Davidjohnwilson/sympy,Arafatk/sympy,jerli/sympy,maniteja123/sympy,Shaswat27/sympy,oliverlee/sympy,shikil/sympy,Shaswat27/sympy,iamutkarshtiwari/sympy,MridulS/sympy,AkademieOlympia/sympy,cswiercz/sympy,lidavidm/sympy,Titan-C/sympy,ChristinaZografou/sympy,cswiercz/sympy,wanglongqi/sympy,yukoba/sympy,skidzo/sympy,Davidjohnwilson/sympy,MridulS/sympy,mcdaniel67/sympy,kumarkrishna/sympy,sahilshekhawat/sympy,ahhda/sympy,Gadal/sympy,VaibhavAgarwalVA/sympy,souravsingh/sympy,sampadsaha5/sympy,postvakje/sympy,aktech/sympy,mafiya69/sympy,aktech/sympy,aktech/sympy,lidavidm/sympy,sahmed95/sympy,sunny94/temp,bukzor/sympy,toolforger/sympy,VaibhavAgarwalVA/sympy,abhiii5459/sympy,cccfran/sympy,MechCoder/sympy,garvitr/sympy,pbrady/sympy,kaichogami/sympy,srjoglekar246/sympy,cccfran/sympy,Gadal/sympy,asm666/sympy,drufat/sympy,MechCoder/sympy,jbbskinny/sympy,Titan-C/sympy,atreyv/sympy,bukzor/sympy,tovrstra/sympy,meghana1995/sympy,jaimahajan1997/sympy,mcdaniel67/sympy,maniteja123/sympy,emon10005/sympy,Arafatk/sympy,vipulroxx/sympy,ga7g08/sympy,hargup/sympy,postvakje/sympy,shipci/sympy,beni55/sympy,Davidjohnwilson/sympy,yashsharan/sympy,lindsayad/sympy,shipci/sympy,kaushik94/sympy,madan96/sympy,saurabhjn76/sympy,meghana1995/sympy,toolforger/sympy,kevalds51/sympy,hargup/sympy,jaimahajan1997/sympy,chaffra/sympy,MechCoder/sympy,lindsayad/sympy,Vishluck/sympy,debugger22/sympy,jbbskinny/sympy,AunShiLord/sympy,Designist/sympy,dqnykamp/sympy,pandeyadarsh/sympy,ahhda/sympy,KevinGoodsell/sympy,meghana1995/sympy,souravsingh/sympy,hazelnusse/sympy-old,saurabhjn76/sympy,vipulroxx/sympy,atsao72/sympy,sunny94/temp,rahuldan/sympy,shikil/sympy,iamutkarshtiwari/sympy,yukoba/sympy,rahuldan/sympy,maniteja123/sympy,Sumith1896/sympy,AkademieOlympia/sympy,minrk/sympy,pandeyadarsh/sympy,vipulroxx/sympy,farhaanbukhsh/sympy,postvakje/sympy,skidzo/sympy,sahilshekhawat/sympy,diofant/diofant,beni55/sympy,lindsayad/sympy,dqnykamp/sympy,jbbskinny/sympy,debugger22/sympy,ChristinaZografou/sympy,madan96/sympy,Mitchkoens/sympy,MridulS/sympy,abhiii5459/sympy,sunny94/temp,liangjiaxing/sympy,mcdaniel67/sympy,oliverlee/sympy,yashsharan/sympy,pbrady/sympy,jbaayen/sympy,chaffra/sympy,mattpap/sympy-polys,asm666/sympy