Speed up javascript Travis CI jobs (#8361)
Speed up javascript Travis CI jobs (#8361)

* Speed up javascript Travis CI jobs

Skip mvn install for javascript CI jobs since it is not needed.

* Specify base filepath for source files

* Remove coveralls

michaelschiff/druid,himanshug/druid,nishantmonu51/druid,monetate/druid,druid-io/druid,monetate/druid,gianm/druid,deltaprojects/druid,mghosh4/druid,monetate/druid,monetate/druid,implydata/druid,jon-wei/druid,implydata/druid,Fokko/druid,implydata/druid,pjain1/druid,gianm/druid,jon-wei/druid,Fokko/druid,mghosh4/druid,gianm/druid,michaelschiff/druid,gianm/druid,himanshug/druid,druid-io/druid,Fokko/druid,jon-wei/druid,mghosh4/druid,nishantmonu51/druid,michaelschiff/druid,nishantmonu51/druid,Fokko/druid,nishantmonu51/druid,michaelschiff/druid,Fokko/druid,jon-wei/druid,Fokko/druid,deltaprojects/druid,deltaprojects/druid,deltaprojects/druid,leventov/druid,pjain1/druid,mghosh4/druid,leventov/druid,himanshug/druid,michaelschiff/druid,pjain1/druid,pjain1/druid,deltaprojects/druid,leventov/druid,mghosh4/druid,leventov/druid,pjain1/druid,himanshug/druid,leventov/druid,gianm/druid,nishantmonu51/druid,pjain1/druid,himanshug/druid,implydata/druid,jon-wei/druid,michaelschiff/druid,implydata/druid,deltaprojects/druid,nishantmonu51/druid,monetate/druid,deltaprojects/druid,monetate/druid,mghosh4/druid,pjain1/druid,druid-io/druid,Fokko/druid,nishantmonu51/druid,gianm/druid,jon-wei/druid,druid-io/druid,jon-wei/druid,druid-io/druid,implydata/druid,monetate/druid,mghosh4/druid,michaelschiff/druid,gianm/druid