Add --stacktrace to gradle build command.
Add --stacktrace to gradle build command.

Reviewed at https://reviews.apache.org/r/23776/

protochron/aurora,medallia/aurora,shahankhatch/aurora,rdelval/aurora,apache/aurora,mschenck/aurora,medallia/aurora,rdelval/aurora,medallia/aurora,kidaa/aurora,kidaa/aurora,protochron/aurora,rdelval/aurora,kidaa/aurora,crashlytics/aurora,rosmo/aurora,shahankhatch/aurora,mschenck/aurora,rosmo/aurora,wfarner/aurora,crashlytics/aurora,rosmo/aurora,apache/aurora,apache/aurora,shahankhatch/aurora,thinker0/aurora,mkhutornenko/incubator-aurora,mschenck/aurora,rosmo/aurora,mkhutornenko/incubator-aurora,rdelval/aurora,wfarner/aurora,medallia/aurora,shahankhatch/aurora,shahankhatch/aurora,mschenck/aurora,wfarner/aurora,medallia/aurora,medallia/aurora,apache/aurora,crashlytics/aurora,thinker0/aurora,mschenck/aurora,protochron/aurora,crashlytics/aurora,mkhutornenko/incubator-aurora,thinker0/aurora,protochron/aurora,kidaa/aurora,mschenck/aurora,thinker0/aurora,mkhutornenko/incubator-aurora,wfarner/aurora,apache/aurora,rdelval/aurora,rosmo/aurora,kidaa/aurora,crashlytics/aurora,apache/aurora,protochron/aurora,protochron/aurora,rdelval/aurora,thinker0/aurora,rosmo/aurora,wfarner/aurora,thinker0/aurora,wfarner/aurora,crashlytics/aurora,shahankhatch/aurora,kidaa/aurora,mkhutornenko/incubator-aurora