Adding filter bar support to Dashboard and Visualize

[simianhacker]

• Closes Interactive filtering #1526 and Closes Filter data with pie's queries on slice drill down. #538
• Adding fitler bar to Dashboard
• Addign filter bar to Visualize
• Adding click and brush handler to filter_bar component
• Adding tests for all the things
• Adding brush events to all apps
• Consolidate all filter addition code to filter bar
• Add donut option to pie visualization
• Adding AggConfigResult to hierarchical data
• Adding picker for multiple filter items
• Moved apply, disabled, negate to $$meta
• Removed $$hashKey from fitlers (part of the input box apply)

[rashidkpc]

http://localhost:8000/#/dashboard?_a=(filters:!(('$$hashKey':'085','$$indexPattern':'logstash-*','$$meta':(apply:!t,disabled:!f,key:geo.src,negate:!f,value:CN),query:(match:(geo.src:(query:CN,type:phrase)))),('$$hashKey':'086','$$indexPattern':'logstash-*','$$meta':(apply:!t,disabled:!f,key:extension,negate:!f,value:gif),query:(match:(extension:(query:gif,type:phrase))))),panels:!((col:1,row:1,size_x:3,size_y:4,visId:beer_-slash-_wine)),query:(query_string:(query:'*')),title:'New%20Dashboard')&_g=(time:(from:'2014-11-24T21:50:59.227Z',mode:absolute,to:'2014-11-24T23:18:16.995Z'))

We should strip out $$ keys from the URL

[rashidkpc]

#2117 severely impacts this. This is probably merge-able as is, but without #2117 there are random things that can't be clicked on.