[scm] Add feature to use more than one filter at the same point when
using type_analysis.

type_analysis used to work as a tuple or a list of 2 elements:
  type_analysis = ["repository", "repository.git"]

In the following, this accepts more than one analysis separated by commas:
  type_analysis = ["repository,company", "repository.git,company"]

In any case the approach using commas should be later improved.
[scm] Add bots as a filter for all of the metrics in SCM
[scm] Fix error when calculating bots and addition of more examples of use
[report tool] Bots as specified in the config file do now reach the
              filters in each of the instantiated metrics.
[scm] Add bot filtering fixing in scm side

In addition minor fixes were added. Tables supposed to be in the
identities db are now part of the scm db.
[scm] Update SCM metrics to work with "containers" of fields
      instead of building themselves the query string
Merge branch 'master' into scm_query_builder
Fix conflicts in example

Conflicts:
	vizgrimoire/metrics/scm_metrics.py
Merge branch 'scm_query_builder'