Have travis take shallow clones of the repo (#10275)
Have travis take shallow clones of the repo (#10275)

Just cloning TS on travis takes 23 seconds on linux (68 seconds on mac), hopefully having it do a shallow clone will help.

We don't rely on any tagging/artifacts from the travis servers which clone depth could impact, so this shouldn't impact anything other than build speed.
microsoft/TypeScript,alexeagle/TypeScript,jwbay/TypeScript,chuckjaz/TypeScript,RyanCavanaugh/TypeScript,alexeagle/TypeScript,basarat/TypeScript,thr0w/Thr0wScript,weswigham/TypeScript,vilic/TypeScript,jwbay/TypeScript,jeremyepling/TypeScript,microsoft/TypeScript,kitsonk/TypeScript,chuckjaz/TypeScript,chuckjaz/TypeScript,TukekeSoft/TypeScript,nojvek/TypeScript,mihailik/TypeScript,mihailik/TypeScript,vilic/TypeScript,weswigham/TypeScript,Eyas/TypeScript,synaptek/TypeScript,SaschaNaz/TypeScript,erikmcc/TypeScript,TukekeSoft/TypeScript,SaschaNaz/TypeScript,donaldpipowitch/TypeScript,minestarks/TypeScript,mihailik/TypeScript,erikmcc/TypeScript,vilic/TypeScript,erikmcc/TypeScript,Eyas/TypeScript,SaschaNaz/TypeScript,jeremyepling/TypeScript,Microsoft/TypeScript,kpreisser/TypeScript,RyanCavanaugh/TypeScript,kpreisser/TypeScript,synaptek/TypeScript,TukekeSoft/TypeScript,Microsoft/TypeScript,jeremyepling/TypeScript,donaldpipowitch/TypeScript,mihailik/TypeScript,thr0w/Thr0wScript,DLehenbauer/TypeScript,thr0w/Thr0wScript,jwbay/TypeScript,donaldpipowitch/TypeScript,basarat/TypeScript,chuckjaz/TypeScript,kitsonk/TypeScript,SaschaNaz/TypeScript,minestarks/TypeScript,microsoft/TypeScript,jwbay/TypeScript,Microsoft/TypeScript,nojvek/TypeScript,DLehenbauer/TypeScript,kpreisser/TypeScript,basarat/TypeScript,kitsonk/TypeScript,Eyas/TypeScript,nojvek/TypeScript,erikmcc/TypeScript,Eyas/TypeScript,minestarks/TypeScript,RyanCavanaugh/TypeScript,thr0w/Thr0wScript,DLehenbauer/TypeScript,synaptek/TypeScript,DLehenbauer/TypeScript,donaldpipowitch/TypeScript,weswigham/TypeScript,synaptek/TypeScript,basarat/TypeScript,alexeagle/TypeScript,vilic/TypeScript,nojvek/TypeScript