Separate message to send html +  plain_text message
Refactor program output classes. Now text is generated in two separate classes, which are later used by the printer/email sender.
Rename module.

Since I deleted the OrderPrinter module and move its class into the OrderMailSender module, which contains several different classes, a name change was mandatory.
Adding first html code. Still not working well.
HTML working using tables.
Use of -q bug in mail repaired.
HTML tables updated.
Use of -q bug in mail repaired.
HTML tables updated.
Adding css style and <div> usage for html tables
Merge branch 'HTML' of https://github.com/mig42/mail-tracker into HTML
Merge branches 'HTML' and 'master' of https://github.com/mig42/mail-tracker into HTML
Remove format padding and html classes.

Since multiple whitespaces are redundant in html, parameters like {0: ^20} have to be removed as they are useless.
Also, as we're not using style sections in html head, using 'class' parameters in divs doesn't make sense.
Refactor HTML to make it more understandable
Remove 'text' parameter from writers.
Remove unnecessary unicode constant
Rename sample codes. Add separator after unexisting orders.
Merge pull request #4 from mig42/HTML

Html