add new TAGLIST_ORDER option

[Joxit]

Create new option named TAGLIST_ORDER that will order tags using user defined configuration.

Available values are:

value	description
num-asc;alpha-asc	Numbers come first in ascending order then alphabet in ascending order
num-desc;alpha-asc	Numbers come first in descending order then alphabet in ascending order
num-asc;alpha-desc	Numbers come first in ascending order then alphabet in descending order
num-desc;alpha-desc	Numbers come first in descending order then alphabet in descending order
alpha-asc;num-asc	Alphabet come first in ascending order then numbers in ascending order
alpha-asc;num-desc (default)	Alphabet come first in ascending order then numbers in descending order
alpha-desc;num-asc	Alphabet come first in descending order then numbers in ascending order
alpha-desc;num-desc	Alphabet come first in descending order then numbers in descending order

Some examples in test/taglist-order.test.js

closes #294