THIS outbreak came from a single bite from a bat.
However ebola circulates through various animal populations without killing them.
Rodents, pigs, bats, dogs and more.
Pubmed is full of examples of these animals being used in lab experiments.
This one is particularly relevant:
http://www.thefreelibrary.com/Ebola+virus+antibody+prevalence+in+dogs+and+human+risk.-a0131127452
Nope, not proven. Bats were the vector elsewhere in Africa, but there's no evidence of them causing the first case in Guinea.