Use printf to print binary characters

Closes #204 (closed)

The reason we have echo -e is to be able to use things like \033 for colors. But echo -e is not portable. I am hoping printf is.

mentioned in commit 0665ef27

merged

@jacobvosmaer-gitlab LGTM!

By the way, we seem to have unrelated test failure:

ERROR:  relation "index_routes_on_path_text_pattern_ops" already exists
17:45:18 postgresql.1            | STATEMENT:  CREATE INDEX CONCURRENTLY index_routes_on_path_text_pattern_ops ON routes (path varchar_pattern_ops);
rake aborted!
ActiveRecord::StatementInvalid: PG::DuplicateTable: ERROR:  relation "index_routes_on_path_text_pattern_ops" already exists
: CREATE INDEX CONCURRENTLY index_routes_on_path_text_pattern_ops ON routes (path varchar_pattern_ops);
/home/gdk/gitlab-development-kit/gitlab/db/migrate/20170317203554_index_routes_path_for_like.rb:18:in `up'

Is 20170317203554_index_routes_path_for_like.rb broken?

By the way, we seem to have unrelated test failure

Solved on Slack. Thanks @smcgivern