Merge pull request #18 from fengjingchao/inst

name change to go-distributed
Merge pull request #19 from yifan-gu/dev

tests for accepted process
Merge branch 'dev' of https://github.com/yifan-gu/epaxos into inst
add initInstance and updateInstance and refine test
refactor test and change getcopy to clone
Merge pull request #22 from fengjingchao/inst

Add more test and refactor code
fix test in set up preparing instance
add handlePrepareReply
small modify