added completion script for Cloud Foundry CLI

[dkoper]

Fixes #78

[codecov-io]

Codecov Report

Merging #80 into master will not change coverage. The diff coverage is n/a.

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[chrisant996]

I would like include this, but it has a dangerous problem:

It runs the entire command line on every completion, including other commands in the command line: del * & cf Tab will actually run both the del * and the cf command.

This can be partially mitigated by using clink.parseline() and using only the last line_state.

But that's not sufficient, either -- for example: >foo cf Tab will run the command and redirect output to foo.

To be able to include this, the argmatcher would need to be more discriminating about what it runs. For example, it could use Responding to Arguments in Argmatchers and user_data to collect the words that are relevant to the cf command itself, and run only cf with those arguments.