Added leading zero

Added an optional feature that adds a leading zero to a number if it is
smaller than 10. Updated docs as well.
added simple variable for S for plural/singular units
set restrict to EAC

You should be able to use elements as well as attributes and classes in
your HTML markup
add leading zero update

updated the code to use separate scope variables
Updated docs
add e2e test for leading zero
Merge pull request #56 from WanjaStier/master

Added e2e test for leading zero
added e2e test for singular / plural units.
Merged singular / plural change with master.
Merge pull request #54 from itslenny/master

added simple variable for S for plural/singular units