Feature 98 day and month pipe rework

[kevinstyp]

• day number of week pipe (ie. 4)
• day name of week pipe (ie. Tuesday)
• month number of year pipe (ie. 3)
• month name of year pipe (ie. March)
• dokumentation

[coveralls]

Coverage remained the same at 100.0% when pulling 1d67840 on feature-98-day-and-month-pipe-rework into 154d26d on dev.

[jhuenges]

@kevinstyp Ich hab den von @simonschwan zu erst gemerged. Du müsstest nochmal die Konflikte beseitigen.

EDIT: LGTM

[coveralls]

Coverage remained the same at 100.0% when pulling a9d768d on feature-98-day-and-month-pipe-rework into d5645b6 on dev.

[kevinstyp]

@jhuenges done :)