Merge pull request #43 from xiaoyunwu/master

implement bootstrap interface 
Merge pull request #44 from xiaoyunwu/master

first step toward regression test
Merge pull request #47 from xiaoyunwu/master

initial regression test and refactored the topology interface
framework test use taskbuilder to initialize task
Merge pull request #48 from fengjingchao/master

framework test use taskbuilder to initialize task
add method to interface that tells if the topology is stationary