Revert "Checkout 0.7.3 before testing in Travis"
Revert "Checkout 0.7.3 before testing in Travis"

This reverts commit 3d56d4b8c1d8346bc92bc23487cbb82214c6c476.

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