Travis: test against matplotlib
Travis: test against matplotlib

The matplotlib test was added to the gmpy tests. That way, we either test pure
Python, or Python+"all libraries".

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