Add support for google closure library
Add support for google closure library

When the closure library is installed by npm, it is named "google-closure-library", however it is named "closure-library" in build.py. When both blockly and closure are installed by npm, they are in the same folder so theoretically theoretically blockly should be able to build. Formatting and indentation might be a bit off as I edited this using the github editor. 

This ```python
search_paths = calcdeps.ExpandDirectories(
      ["core", os.path.join(os.path.pardir, "closure-library")])
``` might need further revision to account for the additional naming. Maybe a try statement?
twodee/blockly,marianoguerra/blockly,OpenRoberta/blockly,hkoi/blockly,aninternetof/blockly,InspectorWidget/blockly,trodi/blockly,gupta137/blockly,carlosperate/ardublockly,rachel-fenichel/blockly,carlosperate/blockly,picklesrus/blockly,OpenRoberta/blockly,groklearning/blockly,groklearning/blockly,stefan-j/blockly,mark-friedman/blockly,google/blockly-devtools,google/blockly,drigz/blockly,picklesrus/blockly,ralic/blockly,google/blockly-devtools,rachel-fenichel/blockly,gengshenghong/scratch-blocks,joshlory/blockly,lzairdking/blockly,jano42/blockly,mark-friedman/blockly,mark-friedman/blockly,nickmain/blockly,gupta137/blockly,jstnhuang/blockly,nickmain/blockly,gudtago/blockly,carlosperate/ardublockly,sclements/scratch-blocks,HALtheWise/blockly,TechplexEngineer/blockly,google/blockly,cmillani/blockly,aravart/speech-blocks,dhalupa/blockly,twodee/blockly,joshlory/blockly,jstnhuang/blockly,joshlory/blockly,Tinkerforge/tvpl-blockly,ralic/blockly,gudtago/blockly,picklesrus/blockly,edbutler/blockly,LLK/scratch-blocks,mark-friedman/blockly,trinketapp/blockly,LLK/scratch-blocks,Tinkerforge/tvpl-blockly,jano42/blockly,ralic/blockly,cmillani/blockly,hkoi/blockly,gupta137/blockly,google/blockly,nickmain/blockly,ChinJY/blockly,ChinJY/blockly,jisqyv/blockly,dhalupa/blockly,marianoguerra/blockly,Immortalin/blockly,jstnhuang/blockly,mark-friedman/blockly,sclements/scratch-blocks,carlosperate/blockly,in1004kyu/tokitool,aninternetof/blockly,ChinJY/blockly,dhalupa/blockly,rachel-fenichel/blockly,griffpatch/scratch-blocks,RealTimeWeb/blockly,gengshenghong/scratch-blocks,trodi/blockly,gengshenghong/scratch-blocks,jano42/blockly,trinketapp/blockly,sclements/scratch-blocks,nickmain/blockly,RealTimeWeb/blockly,twodee/blockly,stefan-j/blockly,google/blockly,drigz/blockly,sclements/scratch-blocks,groklearning/blockly,lzairdking/blockly,Immortalin/blockly,drigz/blockly,mark-friedman/blockly,lzairdking/blockly,LLK/scratch-blocks,rachel-fenichel/blockly,edbutler/blockly,nickmain/blockly,rachel-fenichel/blockly,gengshenghong/scratch-blocks,aninternetof/blockly,jisqyv/blockly,CocoMake7/CocoBlockly,trodi/blockly,trodi/blockly,TechplexEngineer/blockly,Immortalin/blockly,daarond/blockly,OpenRoberta/blockly,Tinkerforge/tvpl-blockly,griffpatch/scratch-blocks,markocelan/blockly-minecraft,google/blockly,carlosperate/blockly,twodee/blockly,griffpatch/scratch-blocks,sclements/scratch-blocks,RealTimeWeb/blockly,markocelan/blockly-minecraft,nickmain/blockly,carloslfu/blockly,gudtago/blockly,griffpatch/scratch-blocks,in1004kyu/tokitool,gengshenghong/scratch-blocks,carloslfu/blockly,marianoguerra/blockly,aravart/speech-blocks,griffpatch/scratch-blocks,daarond/blockly,InspectorWidget/blockly,LLK/scratch-blocks,twodee/blockly,twodee/blockly,LLK/scratch-blocks,google/blockly,rachel-fenichel/blockly,OpenRoberta/blockly,stefan-j/blockly,stefan-j/blockly,CocoMake7/CocoBlockly,carloslfu/blockly,in1004kyu/tokitool,jano42/blockly,lzairdking/blockly,carlosperate/blockly,HALtheWise/blockly,rachel-fenichel/blockly,trinketapp/blockly,google/blockly,markocelan/blockly-minecraft,InspectorWidget/blockly,jstnhuang/blockly,cmillani/blockly,markocelan/blockly-minecraft,groklearning/blockly,carlosperate/ardublockly,daarond/blockly,CocoMake7/CocoBlockly,HALtheWise/blockly,edbutler/blockly,trinketapp/blockly,jisqyv/blockly,hkoi/blockly