[REEF-1330] Add *.VC.db to .gitignore
[REEF-1330] Add *.VC.db to .gitignore

JIRA:
  [REEF-1330](https://issues.apache.org/jira/browse/REEF-1330)

Pull Request:
  This closes #941

apache/reef,afchung/reef,jwang98052/incubator-reef,shravanmn/reef,anupam128/reef,anupam128/reef,afchung/incubator-reef,tcNickolas/reef,jsjason/incubator-reef,motus/reef,nachocano/incubator-reef,apache/reef,motus/reef,afchung/incubator-reef,dongjoon-hyun/incubator-reef,shravanmn/reef,dongjoon-hyun/reef,afchung/reef,apache/reef,singlis/reef,shulmanb/reef,dongjoon-hyun/incubator-reef,afchung/incubator-reef,markusweimer/reef,motus/reef,markusweimer/reef,markusweimer/incubator-reef,markusweimer/incubator-reef,apache/reef,nachocano/incubator-reef,apache/incubator-reef,shulmanb/reef,singlis/reef,tcNickolas/reef,tcNickolas/incubator-reef,apache/reef,anupam128/reef,tcNickolas/reef,markusweimer/reef,jsjason/incubator-reef,dougmsft/reef,jwang98052/incubator-reef,jwang98052/incubator-reef,nachocano/incubator-reef,tcNickolas/incubator-reef,nachocano/incubator-reef,motus/reef,motus/reef,nachocano/incubator-reef,markusweimer/incubator-reef,dougmsft/reef,apache/reef,dougmsft/reef,apache/incubator-reef,markusweimer/incubator-reef,afchung/reef,apache/incubator-reef,jsjason/incubator-reef,jwang98052/incubator-reef,dougmsft/reef,dongjoon-hyun/incubator-reef,shravanmn/reef,jwang98052/incubator-reef,afchung/incubator-reef,afchung/incubator-reef,tcNickolas/reef,singlis/reef,singlis/reef,jwang98052/reef,dongjoon-hyun/incubator-reef,afchung/incubator-reef,jwang98052/reef,tcNickolas/reef,dongjoon-hyun/incubator-reef,shulmanb/reef,markusweimer/reef,jsjason/incubator-reef,shulmanb/reef,dongjoon-hyun/reef,motus/reef,dougmsft/reef,shravanmn/reef,dongjoon-hyun/reef,jsjason/incubator-reef,jwang98052/reef,shulmanb/reef,jwang98052/incubator-reef,tcNickolas/reef,jwang98052/reef,markusweimer/incubator-reef,dougmsft/reef,markusweimer/reef,jwang98052/reef,shravanmn/reef,tcNickolas/incubator-reef,afchung/incubator-reef,jwang98052/incubator-reef,dongjoon-hyun/reef,dongjoon-hyun/incubator-reef,nachocano/incubator-reef,motus/reef,shulmanb/reef,markusweimer/incubator-reef,apache/incubator-reef,singlis/reef,shulmanb/reef,jwang98052/reef,markusweimer/reef,afchung/reef,anupam128/reef,jsjason/incubator-reef,anupam128/reef,shravanmn/reef,afchung/reef,dongjoon-hyun/reef,singlis/reef,tcNickolas/incubator-reef,markusweimer/incubator-reef,apache/incubator-reef,apache/incubator-reef,dongjoon-hyun/reef,afchung/reef,apache/incubator-reef,shravanmn/reef,apache/reef,anupam128/reef,tcNickolas/incubator-reef,jsjason/incubator-reef,nachocano/incubator-reef,singlis/reef,anupam128/reef,afchung/reef,markusweimer/reef,dougmsft/reef,tcNickolas/incubator-reef,tcNickolas/incubator-reef,jwang98052/reef,tcNickolas/reef,dongjoon-hyun/reef,dongjoon-hyun/incubator-reef