Travis: Install frappe of targetted branch
Travis: Install frappe of targetted branch

For example:
If pull request is for wip-4.1 branch of erpnext, install frappe with branch as wip-4.1

aruizramon/alec_erpnext,gangadharkadam/v4_erp,gangadharkadam/johnerp,indictranstech/biggift-erpnext,indictranstech/buyback-erp,gangadharkadam/office_erp,netfirms/erpnext,mbauskar/omnitech-demo-erpnext,suyashphadtare/gd-erp,indictranstech/osmosis-erpnext,indictranstech/Das_Erpnext,mahabuber/erpnext,MartinEnder/erpnext-de,rohitwaghchaure/New_Theme_Erp,gangadharkadam/v6_erp,indictranstech/erpnext,gangadhar-kadam/laganerp,suyashphadtare/vestasi-erp-1,gangadharkadam/sher,gangadhar-kadam/helpdesk-erpnext,gangadharkadam/vlinkerp,MartinEnder/erpnext-de,gangadhar-kadam/helpdesk-erpnext,indictranstech/focal-erpnext,mbauskar/omnitech-erpnext,gangadhar-kadam/helpdesk-erpnext,hanselke/erpnext-1,indictranstech/fbd_erpnext,suyashphadtare/vestasi-update-erp,indictranstech/biggift-erpnext,gmarke/erpnext,rohitwaghchaure/erpnext-receipher,suyashphadtare/vestasi-erp-jan-end,hatwar/Das_erpnext,suyashphadtare/vestasi-erp-jan-end,Suninus/erpnext,mbauskar/helpdesk-erpnext,gangadharkadam/smrterp,Tejal011089/huntercamp_erpnext,suyashphadtare/test,susuchina/ERPNEXT,Tejal011089/paypal_erpnext,ThiagoGarciaAlves/erpnext,MartinEnder/erpnext-de,dieface/erpnext,gangadharkadam/tailorerp,gangadharkadam/contributionerp,gangadhar-kadam/laganerp,suyashphadtare/vestasi-erp-1,indictranstech/internal-erpnext,shft117/SteckerApp,gangadharkadam/letzerp,njmube/erpnext,sheafferusa/erpnext,hatwar/buyback-erpnext,gangadharkadam/saloon_erp_install,aruizramon/alec_erpnext,gangadhar-kadam/smrterp,indictranstech/reciphergroup-erpnext,gangadharkadam/johnerp,Tejal011089/paypal_erpnext,indictranstech/Das_Erpnext,indictranstech/trufil-erpnext,mbauskar/phrerp,shitolepriya/test-erp,indictranstech/trufil-erpnext,mbauskar/Das_Erpnext,rohitwaghchaure/GenieManager-erpnext,suyashphadtare/sajil-erp,Tejal011089/trufil-erpnext,sheafferusa/erpnext,suyashphadtare/gd-erp,Suninus/erpnext,rohitwaghchaure/New_Theme_Erp,aruizramon/alec_erpnext,suyashphadtare/sajil-erp,4commerce-technologies-AG/erpnext,sheafferusa/erpnext,gangadharkadam/letzerp,gangadharkadam/saloon_erp,suyashphadtare/vestasi-erp-final,BhupeshGupta/erpnext,rohitwaghchaure/New_Theme_Erp,gangadharkadam/vlinkerp,gangadhar-kadam/latestchurcherp,pombredanne/erpnext,ShashaQin/erpnext,treejames/erpnext,aruizramon/alec_erpnext,njmube/erpnext,Tejal011089/fbd_erpnext,anandpdoshi/erpnext,mbauskar/sapphire-erpnext,suyashphadtare/test,gangadharkadam/v6_erp,SPKian/Testing,Tejal011089/digitales_erpnext,susuchina/ERPNEXT,4commerce-technologies-AG/erpnext,Tejal011089/trufil-erpnext,Aptitudetech/ERPNext,mbauskar/Das_Erpnext,gsnbng/erpnext,saurabh6790/test-erp,mbauskar/sapphire-erpnext,gangadhar-kadam/verve_erp,gangadhar-kadam/verve_live_erp,rohitwaghchaure/GenieManager-erpnext,rohitwaghchaure/erpnext-receipher,suyashphadtare/sajil-final-erp,indictranstech/erpnext,geekroot/erpnext,shitolepriya/test-erp,mbauskar/Das_Erpnext,gangadharkadam/v4_erp,mbauskar/alec_frappe5_erpnext,geekroot/erpnext,Drooids/erpnext,mbauskar/omnitech-demo-erpnext,mbauskar/helpdesk-erpnext,indictranstech/erpnext,mbauskar/sapphire-erpnext,indictranstech/buyback-erp,SPKian/Testing2,rohitwaghchaure/erpnext-receipher,Tejal011089/huntercamp_erpnext,gangadharkadam/verveerp,suyashphadtare/test,Tejal011089/fbd_erpnext,MartinEnder/erpnext-de,4commerce-technologies-AG/erpnext,njmube/erpnext,mahabuber/erpnext,hernad/erpnext,gangadharkadam/office_erp,Tejal011089/huntercamp_erpnext,fuhongliang/erpnext,njmube/erpnext,rohitwaghchaure/GenieManager-erpnext,suyashphadtare/vestasi-erp-jan-end,hernad/erpnext,mbauskar/Das_Erpnext,indictranstech/phrerp,netfirms/erpnext,rohitwaghchaure/digitales_erpnext,mbauskar/alec_frappe5_erpnext,gangadharkadam/saloon_erp_install,indictranstech/internal-erpnext,gangadharkadam/v6_erp,gmarke/erpnext,saurabh6790/test-erp,gangadharkadam/contributionerp,indictranstech/trufil-erpnext,ThiagoGarciaAlves/erpnext,gangadhar-kadam/latestchurcherp,netfirms/erpnext,suyashphadtare/vestasi-update-erp,mbauskar/alec_frappe5_erpnext,rohitwaghchaure/digitales_erpnext,suyashphadtare/gd-erp,tmimori/erpnext,gsnbng/erpnext,gangadhar-kadam/verve_test_erp,Tejal011089/osmosis_erpnext,suyashphadtare/vestasi-erp-final,meisterkleister/erpnext,gangadhar-kadam/verve_test_erp,Tejal011089/digitales_erpnext,Tejal011089/paypal_erpnext,hatwar/focal-erpnext,indictranstech/phrerp,hernad/erpnext,fuhongliang/erpnext,susuchina/ERPNEXT,hanselke/erpnext-1,hernad/erpnext,gangadharkadam/v5_erp,gangadhar-kadam/verve-erp,dieface/erpnext,saurabh6790/test-erp,gangadhar-kadam/verve_erp,indictranstech/internal-erpnext,gangadharkadam/v4_erp,Suninus/erpnext,indictranstech/buyback-erp,Tejal011089/digitales_erpnext,indictranstech/phrerp,indictranstech/fbd_erpnext,gangadharkadam/v4_erp,dieface/erpnext,indictranstech/biggift-erpnext,indictranstech/osmosis-erpnext,mbauskar/helpdesk-erpnext,gangadhar-kadam/smrterp,indictranstech/reciphergroup-erpnext,indictranstech/fbd_erpnext,BhupeshGupta/erpnext,gangadhar-kadam/verve_erp,indictranstech/phrerp,gangadharkadam/letzerp,indictranstech/biggift-erpnext,indictranstech/fbd_erpnext,indictranstech/reciphergroup-erpnext,mbauskar/omnitech-demo-erpnext,pombredanne/erpnext,gangadharkadam/verveerp,gangadhar-kadam/verve_live_erp,mbauskar/sapphire-erpnext,gangadharkadam/saloon_erp,treejames/erpnext,meisterkleister/erpnext,suyashphadtare/sajil-final-erp,hatwar/buyback-erpnext,indictranstech/osmosis-erpnext,hatwar/buyback-erpnext,gmarke/erpnext,BhupeshGupta/erpnext,gangadhar-kadam/laganerp,tmimori/erpnext,Tejal011089/fbd_erpnext,shft117/SteckerApp,gangadharkadam/saloon_erp,indictranstech/tele-erpnext,indictranstech/trufil-erpnext,gangadharkadam/contributionerp,gangadhar-kadam/verve_test_erp,pombredanne/erpnext,indictranstech/internal-erpnext,gangadharkadam/saloon_erp,indictranstech/erpnext,hanselke/erpnext-1,Drooids/erpnext,gangadharkadam/v5_erp,SPKian/Testing2,ThiagoGarciaAlves/erpnext,mbauskar/phrerp,gangadhar-kadam/helpdesk-erpnext,rohitwaghchaure/GenieManager-erpnext,hatwar/Das_erpnext,indictranstech/vestasi-erpnext,hanselke/erpnext-1,indictranstech/focal-erpnext,gangadharkadam/verveerp,gangadhar-kadam/verve_live_erp,treejames/erpnext,Drooids/erpnext,treejames/erpnext,gangadharkadam/office_erp,gangadharkadam/vlinkerp,indictranstech/tele-erpnext,fuhongliang/erpnext,pawaranand/phrerp,geekroot/erpnext,rohitwaghchaure/erpnext_smart,indictranstech/osmosis-erpnext,pawaranand/phrerp,mbauskar/phrerp,rohitwaghchaure/erpnext_smart,hatwar/focal-erpnext,suyashphadtare/vestasi-erp-jan-end,indictranstech/tele-erpnext,gangadharkadam/v5_erp,shft117/SteckerApp,anandpdoshi/erpnext,suyashphadtare/sajil-erp,Suninus/erpnext,dieface/erpnext,sagar30051991/ozsmart-erp,indictranstech/reciphergroup-erpnext,mahabuber/erpnext,gsnbng/erpnext,suyashphadtare/vestasi-update-erp,Tejal011089/osmosis_erpnext,gangadharkadam/tailorerp,hatwar/Das_erpnext,gangadharkadam/sterp,suyashphadtare/sajil-final-erp,hatwar/buyback-erpnext,sagar30051991/ozsmart-erp,rohitwaghchaure/New_Theme_Erp,geekroot/erpnext,hatwar/focal-erpnext,hatwar/Das_erpnext,meisterkleister/erpnext,anandpdoshi/erpnext,gmarke/erpnext,Tejal011089/trufil-erpnext,netfirms/erpnext,indictranstech/tele-erpnext,mbauskar/omnitech-erpnext,suyashphadtare/vestasi-erp-1,tmimori/erpnext,sagar30051991/ozsmart-erp,gangadhar-kadam/verve_test_erp,shft117/SteckerApp,gangadhar-kadam/latestchurcherp,SPKian/Testing,indictranstech/vestasi-erpnext,suyashphadtare/gd-erp,rohitwaghchaure/digitales_erpnext,BhupeshGupta/erpnext,gangadharkadam/v6_erp,ShashaQin/erpnext,indictranstech/focal-erpnext,pombredanne/erpnext,rohitwaghchaure/digitales_erpnext,gangadharkadam/saloon_erp_install,gangadhar-kadam/verve-erp,gangadharkadam/verveerp,gangadharkadam/v5_erp,gangadharkadam/contributionerp,Tejal011089/osmosis_erpnext,Tejal011089/trufil-erpnext,Tejal011089/paypal_erpnext,indictranstech/Das_Erpnext,gsnbng/erpnext,shitolepriya/test-erp,gangadhar-kadam/verve-erp,gangadharkadam/sher,SPKian/Testing,meisterkleister/erpnext,ThiagoGarciaAlves/erpnext,pawaranand/phrerp,mbauskar/omnitech-erpnext,saurabh6790/test-erp,fuhongliang/erpnext,gangadharkadam/sterp,gangadharkadam/vlinkerp,Tejal011089/fbd_erpnext,ShashaQin/erpnext,shitolepriya/test-erp,Tejal011089/digitales_erpnext,mbauskar/helpdesk-erpnext,mbauskar/alec_frappe5_erpnext,SPKian/Testing,SPKian/Testing2,Drooids/erpnext,ShashaQin/erpnext,indictranstech/focal-erpnext,tmimori/erpnext,hatwar/focal-erpnext,gangadhar-kadam/verve_erp,sagar30051991/ozsmart-erp,Tejal011089/osmosis_erpnext,Tejal011089/huntercamp_erpnext,gangadharkadam/letzerp,anandpdoshi/erpnext,indictranstech/Das_Erpnext,susuchina/ERPNEXT,mbauskar/omnitech-demo-erpnext,mahabuber/erpnext,indictranstech/buyback-erp,rohitwaghchaure/erpnext-receipher,mbauskar/omnitech-erpnext,indictranstech/vestasi-erpnext,sheafferusa/erpnext,rohitwaghchaure/erpnext_smart,gangadhar-kadam/verve_live_erp,gangadharkadam/smrterp,gangadharkadam/saloon_erp_install,SPKian/Testing2,pawaranand/phrerp,indictranstech/vestasi-erpnext,gangadhar-kadam/latestchurcherp,mbauskar/phrerp,suyashphadtare/vestasi-erp-final