Improved contributing docs.
Improved contributing docs.

  * Added IRC information.
  * Added etiquette section.
  * Added suggestions for ways to help besides writing code.

Change-Id: I4a4eed0b9617b29c1e542043683979396d79df0c

redhat-openstack/horizon,philoniare/horizon,Daniex/horizon,redhat-openstack/horizon,promptworks/horizon,ging/horizon,zouyapeng/horizon,noironetworks/horizon,Hodorable/0602,JioCloud/horizon,takeshineshiro/horizon,mrunge/horizon_lib,openstack-ja/horizon,flochaz/horizon,mrunge/horizon,sandvine/horizon,mrunge/horizon,bac/horizon,Hodorable/0602,orbitfp7/horizon,henaras/horizon,gochist/horizon,LabAdvComp/tukey_portal,ikargis/horizon_fod,gochist/horizon,NCI-Cloud/horizon,nvoron23/avos,endorphinl/horizon,j4/horizon,tsufiev/horizon,kfox1111/horizon,maestro-hybrid-cloud/horizon,wangxiangyu/horizon,tqtran7/horizon,savi-dev/horizon,CiscoSystems/avos,vbannai/disk-qos-horizon,idjaw/horizon,orbitfp7/horizon,wolverineav/horizon,ging/horizon,vbannai/disk-qos-horizon,dan1/horizon-proto,watonyweng/horizon,icloudrnd/automation_tools,JioCloud/horizon,coreycb/horizon,davidcusatis/horizon,eayunstack/horizon,pranavtendolkr/horizon,gerrive/horizon,saydulk/horizon,opencloudconsortium/tukey-portal,LabAdvComp/tukey_portal,watonyweng/horizon,Solinea/horizon,dan1/horizon-x509,Daniex/horizon,froyobin/horizon,BiznetGIO/horizon,NeCTAR-RC/horizon,maestro-hybrid-cloud/horizon,philoniare/horizon,VaneCloud/horizon,ChameleonCloud/horizon,takeshineshiro/horizon,Daniex/horizon,Metaswitch/horizon,rdo-management/tuskar-ui,dan1/horizon-x509,redhat-cip/horizon,doug-fish/horizon,anthonydillon/horizon,zouyapeng/horizon,tqtran7/horizon,BiznetGIO/horizon,Metaswitch/horizon,watonyweng/horizon,gerrive/horizon,xinwu/horizon,mandeepdhami/horizon,luhanhan/horizon,redhat-cip/horizon,bac/horizon,anthonydillon/horizon,froyobin/horizon,kfox1111/horizon,luhanhan/horizon,maestro-hybrid-cloud/horizon,asomya/test,ging/horizon,LabAdvComp/tukey_portal,yeming233/horizon,mrunge/openstack_horizon,mandeepdhami/horizon,bac/horizon,agileblaze/OpenStackTwoFactorAuthentication,tqtran7/horizon,spring-week-topos/horizon-week,Tesora/tesora-horizon,blueboxgroup/horizon,yjxtogo/horizon,froyobin/horizon,bigswitch/horizon,Tesora/tesora-horizon,idjaw/horizon,tsufiev/horizon,izadorozhna/dashboard_integration_tests,Frostman/eho-horizon,openstack/horizon,wangxiangyu/horizon,Hodorable/0602,99cloud/keystone_register,kfox1111/horizon,noironetworks/horizon,VaneCloud/horizon,dan1/horizon-x509,rickerc/horizon_audit,icloudrnd/automation_tools,opencloudconsortium/tukey-portal,kaiweifan/horizon,CiscoSystems/horizon,wangxiangyu/horizon,icloudrnd/automation_tools,FNST-OpenStack/horizon,agileblaze/OpenStackTwoFactorAuthentication,1ukash/horizon,philoniare/horizon,bac/horizon,openstack/horizon,gochist/horizon,nvoron23/avos,maestro-hybrid-cloud/horizon,saydulk/horizon,CiscoSystems/horizon,icloudrnd/automation_tools,tanglei528/horizon,VaneCloud/horizon,redhat-openstack/horizon,citrix-openstack-build/horizon,RudoCris/horizon,tuskar/tuskar-ui,mandeepdhami/horizon,damien-dg/horizon,yanheven/console,liyitest/rr,dan1/horizon-proto,endorphinl/horizon-fork,r-icarus/openstack_microserver,gerrive/horizon,redhat-cip/horizon,tuskar/tuskar-ui,endorphinl/horizon,occ-data/tukey-portal,BiznetGIO/horizon,wolverineav/horizon,henaras/horizon,rickerc/horizon_audit,vladryk/horizon,philoniare/horizon,blueboxgroup/horizon,blueboxgroup/horizon,FNST-OpenStack/horizon,NeCTAR-RC/horizon,dan1/horizon-proto,takeshineshiro/horizon,xme1226/horizon,Daniex/horizon,redhat-cip/horizon,1ukash/horizon,liyitest/rr,tsufiev/horizon,mdavid/horizon,xme1226/horizon,Mirantis/mos-horizon,promptworks/horizon,davidcusatis/horizon,vladryk/horizon,doug-fish/horizon,FNST-OpenStack/horizon,wolverineav/horizon,Dark-Hacker/horizon,vladryk/horizon,netscaler/horizon,aaronorosen/horizon-congress,izadorozhna/dashboard_integration_tests,orbitfp7/horizon,FNST-OpenStack/horizon,anthonydillon/horizon,yeming233/horizon,takeshineshiro/horizon,citrix-openstack-build/horizon,Mirantis/mos-horizon,Dark-Hacker/horizon,bigswitch/horizon,wolverineav/horizon,saydulk/horizon,eayunstack/horizon,redhat-openstack/horizon,mrunge/horizon_lib,promptworks/horizon,r-icarus/openstack_microserver,asomya/test,liyitest/rr,ChameleonCloud/horizon,openstack/horizon,coreycb/horizon,mrunge/horizon,sandvine/horizon,luhanhan/horizon,NCI-Cloud/horizon,damien-dg/horizon,CiscoSystems/horizon,mdavid/horizon,LabAdvComp/tukey_portal,tellesnobrega/horizon,blueboxgroup/horizon,agileblaze/OpenStackTwoFactorAuthentication,nvoron23/avos,bigswitch/horizon,kaiweifan/horizon,netscaler/horizon,saydulk/horizon,CiscoSystems/avos,promptworks/horizon,NCI-Cloud/horizon,openstack/horizon,rdo-management/tuskar-ui,tellesnobrega/horizon,occ-data/tukey-portal,Solinea/horizon,rdo-management/tuskar-ui,tellesnobrega/horizon,xinwu/horizon,aaronorosen/horizon-congress,newrocknj/horizon,vladryk/horizon,Frostman/eho-horizon,j4/horizon,doug-fish/horizon,BiznetGIO/horizon,tuskar/tuskar-ui,newrocknj/horizon,tanglei528/horizon,coreycb/horizon,endorphinl/horizon-fork,yanheven/console,sandvine/horizon,Solinea/horizon,pranavtendolkr/horizon,wangxiangyu/horizon,RudoCris/horizon,davidcusatis/horizon,rdo-management/tuskar-ui,tellesnobrega/horizon,Metaswitch/horizon,mrunge/openstack_horizon,bigswitch/horizon,davidcusatis/horizon,xinwu/horizon,watonyweng/horizon,xinwu/horizon,CiscoSystems/avos,noironetworks/horizon,CiscoSystems/horizon,noironetworks/horizon,flochaz/horizon,RudoCris/horizon,ging/horizon,savi-dev/horizon,endorphinl/horizon-fork,j4/horizon,henaras/horizon,mrunge/horizon_lib,django-leonardo/horizon,99cloud/keystone_register,nvoron23/avos,zouyapeng/horizon,yjxtogo/horizon,RudoCris/horizon,henaras/horizon,kaiweifan/horizon,zouyapeng/horizon,karthik-suresh/horizon,orbitfp7/horizon,spring-week-topos/horizon-week,damien-dg/horizon,opencloudconsortium/tukey-portal,Hodorable/0602,dan1/horizon-x509,ChameleonCloud/horizon,occ-data/tukey-portal,netscaler/horizon,Tesora/tesora-horizon,ikargis/horizon_fod,endorphinl/horizon,newrocknj/horizon,vbannai/disk-qos-horizon,anthonydillon/horizon,doug-fish/horizon,1ukash/horizon,coreycb/horizon,r-icarus/openstack_microserver,sandvine/horizon,karthik-suresh/horizon,django-leonardo/horizon,agileblaze/OpenStackTwoFactorAuthentication,endorphinl/horizon,JioCloud/horizon,openstack-ja/horizon,liyitest/rr,Solinea/horizon,VaneCloud/horizon,j4/horizon,idjaw/horizon,kfox1111/horizon,NeCTAR-RC/horizon,idjaw/horizon,damien-dg/horizon,ikargis/horizon_fod,Dark-Hacker/horizon,tqtran7/horizon,luhanhan/horizon,citrix-openstack-build/horizon,flochaz/horizon,yjxtogo/horizon,tanglei528/horizon,99cloud/keystone_register,karthik-suresh/horizon,Frostman/eho-horizon,savi-dev/horizon,mdavid/horizon,yjxtogo/horizon,NeCTAR-RC/horizon,pranavtendolkr/horizon,django-leonardo/horizon,Mirantis/mos-horizon,aaronorosen/horizon-congress,gerrive/horizon,yeming233/horizon,dan1/horizon-proto,CiscoSystems/avos,rickerc/horizon_audit,karthik-suresh/horizon,yanheven/console,mdavid/horizon,mandeepdhami/horizon,asomya/test,yeming233/horizon,openstack-ja/horizon,tsufiev/horizon,Metaswitch/horizon,spring-week-topos/horizon-week,eayunstack/horizon,endorphinl/horizon-fork,pranavtendolkr/horizon,Dark-Hacker/horizon,ChameleonCloud/horizon,Tesora/tesora-horizon,xme1226/horizon,Mirantis/mos-horizon,django-leonardo/horizon,flochaz/horizon,NCI-Cloud/horizon,mrunge/openstack_horizon,newrocknj/horizon