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