Added dev-ddb to build.boot, updated building documentation

[elibosley]

• Fixes #400, adds documentation about the build process
• Fixes an issue that @Daniel-Hoerauf found with loading private configuration files from two locations

  PR for issue #400.

Ready for a PR?

• [x] I have updated the CHANGELOG with an entry including a description, a link to my profile, and a link to the issue ticket. This change is filed under an Enhancement or Bug Fix, is shown under the relevant release tag name, and is included in my PR branch.

[elibosley]

@dehli This should be good to go, and patches a couple of minor issues

[elibosley]

@dehli This should be good to go!

[dehli]

Actually, one last suggestion would be to create a function that figures out the config file and use that in build.boot (since that logic is currently duplicated).

[elibosley]

@dehli It's currently duplicated because one of the functions has those extra log items - would you still de-duplicate them?

[dehli]

Yep. You can still accomplish logging by doing something like:

(let [config-file (get-config-file)]
  (if config-file
    (log/info (str "Using private config-file " config-file)
    (log/info "Not using a private config-file"))
  config-file)