Add sympy.physics.mechanics to setup.py
Add sympy.physics.mechanics to setup.py

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