Added .dockerignore file to speed up Che Docker image build #1499
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Currently the complete eclipse/che repository (>1GB) was sent to the Docker daemon:
![image](https://cloud.githubusercontent.com/assets/606959/16038457/4f4a5ba8-3225-11e6-962a-59f8f53da350.png)
Adding a .dockerignore file makes the build context 10 times smaller:
![image](https://cloud.githubusercontent.com/assets/606959/16038545/b292a7a6-3225-11e6-8045-aae6c1792516.png)