Add full name to account and use it to create commits (#125)

The Git practice is to use the full name when creating commits, not a
user name. This commit fixes that by introducing a fullName field to
Account and using it when creating commits.

For migrating from earlier versions, the user name is used as an initial
value for the full name field.

src/main/scala/app/CreateRepositoryController.scala

@@ -94,7 +94,7 @@ trait CreateRepositoryControllerBase extends ControllerBase {
             val git = Git.open(tmpdir)
             git.add.addFilepattern("README.md").call
             git.commit
-              .setCommitter(new PersonIdent(loginUserName, loginAccount.mailAddress))
+              .setCommitter(new PersonIdent(loginAccount.fullName, loginAccount.mailAddress))
               .setMessage("Initial commit").call
             git.push.call