fix non-English characters query: #106, #99

fix #104

#98. remove the duplicate elements filter, avoid `htmlquery` and `xml…

…query` packages re-use the cached element in some cases. #94

docs: update `lower-case()` fuction. close #95

fix #92

Merge branch '#82'

fix `last()` #76,#78

fix antchfx/htmlquery#52 Skip the current node(Self:false) for the ne…

…xt descendants nodes.

fix #74

add `groupQuery`, supports grouping node query, (xpath expression). f…

…ix #antchfx/htmlquery#42