Exclude reports directory from idea project.
Exclude reports directory from idea project.

Reviewed at https://reviews.apache.org/r/20650/

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