started to add always tags
passing all the examples including the always ones
better use of the tag monoid for sections
updated the sbt build and removed conflict warnings
be a bit more flexible when parsing ints in steps
added the description for custom sections
refactored the tagging logic
extracted a NamedTag monoid
added an AlwaysTag to tag some fragments so that they are always kept
merged with the always-tag branch
added some documentation for the AlwaysTag
renamed TagsFragments and TaggingFragments
to something simpler