Allow continuous build information and metadata to be serialized along with test runs

[jakedsouza]

It would be useful, if the dbbot could save a table for continuous integration server information for each test run. Analysing the test results in context of CI server information would be a useful feature.

Some of the columns that could be saved

CI_REPO - repository name of the current build
CI_BRANCH - branch name for the current build
CI_COMMIT - git sha for the current build
CI_BUILD_NUMBER - build number for the current build
CI_PULL_REQUEST - pull request number of the current build
CI_BUILD_URL - url for the current build
CI_TAG - tag name for the current build 

This is essentially more metadata for a test run and can be provided as a separate file or arguments to the command line.