Change CI to include `make push`
This replaces the makes for each python version with a simple `make push`. It will also add a "main image" for each version, i.e. `gsiupm/senpy:1.0.0` in addition to `gsiupm/senpy:1.0.0-python2.7` and `gsiupm/senpy:1.0.0-python3.5`.
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