Tcpnetlock

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* Add .bashrc (for developers)
* Fix setup.py

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* Docker start server with --info by default
* Adds cloudbuild.yaml to facilitate building in GCP
* Change in protocol to detect unintended uses
* Detect invalid requests and always send response to client
* BIG refactor of server and client classes
* Add lot of tests (current coverage: 99%)

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* Refactor messy code from server, client and cli

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* Code cleanup and refactor
* Add tests
* Implements run_with_lock script to make really easy to use from shell scripts

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* Create shell script to be sourced, to facilitate use of tcpnetlock from shell scripts

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* Update CONTRIBUTING (documents commands for the full release process)
* Disable upload to pypi from Travis-CI