CI setup for running tests in drone

[dpakach]

drone CI setup

fixes #101

• Implement style check for owncloud coding standard
• Add make targets for running tests
• Add .drone.yml file for drone configurations

[codecov]

Codecov Report

Merging #104 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #104   +/-   ##
=========================================
  Coverage     99.63%   99.63%           
  Complexity       63       63           
=========================================
  Files             8        8           
  Lines           272      272           
=========================================
  Hits            271      271           
  Misses            1        1

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[phil-davis]

The goalposts change a bit every week. See my comments. I think the PRs that I referred to in password_policy and files_antivirus are now good example :)

[phil-davis]

I think the parallel-lint is not used anywhere anyway, so it can easily be removed.
The rest of it looks good.
In the next PRs we can:

• actually delete travis.yml and get "Travis required" taken off the repo.
• add owncloud-coding-standard to the matrix and make the actual needed code changes
• sort out moving unit tests into the tests/unit folder