v1.0.0-rc1

Vote PASSED [+9 -0 # 3]: [1]
There have been 20 PRs merged since v0.3.0, [2] has the list.

[1] https://groups.google.com/a/opencontainers.org/forum/#!topic/dev/cH4nA9tkxw8
[2] #198

Signed-off-by: zhouhao [email protected]