Add clang-format-3.8 to Docker image.
Add clang-format-3.8 to Docker image.

geektoni/shogun,sorig/shogun,shogun-toolbox/shogun,lisitsyn/shogun,lambday/shogun,besser82/shogun,sorig/shogun,shogun-toolbox/shogun,lambday/shogun,sorig/shogun,geektoni/shogun,sorig/shogun,karlnapf/shogun,lisitsyn/shogun,lisitsyn/shogun,lisitsyn/shogun,geektoni/shogun,besser82/shogun,karlnapf/shogun,shogun-toolbox/shogun,sorig/shogun,geektoni/shogun,besser82/shogun,karlnapf/shogun,shogun-toolbox/shogun,shogun-toolbox/shogun,lisitsyn/shogun,lambday/shogun,geektoni/shogun,lambday/shogun,lambday/shogun,besser82/shogun,karlnapf/shogun,besser82/shogun,geektoni/shogun,karlnapf/shogun,shogun-toolbox/shogun,lisitsyn/shogun,lambday/shogun,besser82/shogun,karlnapf/shogun,sorig/shogun