Performance improvements for chart rendering:
Performance improvements for chart rendering:

1. Don't redraw when adding or removing a single series, but redraw at the end.
2. Use $timeout to postpone high charts rendering until DOM is ready.

jmvasquez/redashtest,stefanseifert/redash,amino-data/redash,vishesh92/redash,44px/redash,denisov-vlad/redash,hudl/redash,getredash/redash,getredash/redash,hudl/redash,easytaxibr/redash,M32Media/redash,imsally/redash,alexanderlz/redash,pubnative/redash,moritz9/redash,crowdworks/redash,44px/redash,chriszs/redash,crowdworks/redash,easytaxibr/redash,moritz9/redash,amino-data/redash,akariv/redash,denisov-vlad/redash,easytaxibr/redash,EverlyWell/redash,easytaxibr/redash,guaguadev/redash,ninneko/redash,imsally/redash,vishesh92/redash,alexanderlz/redash,44px/redash,jmvasquez/redashtest,denisov-vlad/redash,akariv/redash,imsally/redash,stefanseifert/redash,rockwotj/redash,chriszs/redash,getredash/redash,M32Media/redash,moritz9/redash,denisov-vlad/redash,jmvasquez/redashtest,chriszs/redash,pubnative/redash,easytaxibr/redash,getredash/redash,akariv/redash,hudl/redash,guaguadev/redash,getredash/redash,jmvasquez/redashtest,stefanseifert/redash,hudl/redash,chriszs/redash,pubnative/redash,M32Media/redash,alexanderlz/redash,amino-data/redash,guaguadev/redash,jmvasquez/redashtest,guaguadev/redash,44px/redash,ninneko/redash,useabode/redash,alexanderlz/redash,useabode/redash,stefanseifert/redash,imsally/redash,useabode/redash,vishesh92/redash,moritz9/redash,amino-data/redash,rockwotj/redash,ninneko/redash,denisov-vlad/redash,akariv/redash,rockwotj/redash,akariv/redash,stefanseifert/redash,rockwotj/redash,guaguadev/redash,EverlyWell/redash,EverlyWell/redash,useabode/redash,ninneko/redash,pubnative/redash,ninneko/redash,crowdworks/redash,vishesh92/redash,M32Media/redash,crowdworks/redash,pubnative/redash,EverlyWell/redash