Add LDAP configuration tasks

[lae]

Fixes #11

This adds a grafana_ldap role variable that is used in populating the LDAP configuration file (which can be configured to be something other than the default).

Group mappings are defined on an organization basis rather than a several separate mappings.

There's one shortcoming in this PR - extra organizations aren't created if they're defined. I was thinking I would hit the API to do so, but I'm not sure how I would go about creating organizations with specific IDs correctly (say I defined org 3 before 2 in group_mappings, or even skipped org.id: 2) when the API (understandably) only lets you create the next available org_id with a name.

[paulfantom]

lacks , at the end of line

[paulfantom]

Seems like yamllint doesn't like booleans starting from uppercase letter:

--> Executing Yamllint on files found in /home/travis/build/cloudalchemy/ansible-grafana/...
    /home/travis/build/cloudalchemy/ansible-grafana/molecule/alternative/playbook.yml
      20:24     warning  truthy value should be true or false  (truthy)
      23:24     warning  truthy value should be true or false  (truthy)
      27:18     warning  truthy value should be true or false  (truthy)
      28:20     warning  truthy value should be true or false  (truthy)
      29:26     warning  truthy value should be true or false  (truthy)

[lae]

Yeah, I usually write bools in lowercase but was attempting to mimic style from the allow_sign_up right above where I edited the defaults in this role - I guess that was a mistake so I went ahead and fixed that and made the README consistent as well.

[lock]

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