fix #1409 reset page num when changing items/page

when chaning number of items per page on a paginated view,
reset page number to 1
fix #1371 pass params to pagination helper

give pagination helper (pagination_links_full and per_page_links)
params which thay can forward to the link generation.
add cuke to test items per page feature
fix project settings path in cukes
add cuke for changing members per page in project settings
add bugfixes to changelog

Conflicts:
	doc/CHANGELOG.md

Conflicts:
	doc/CHANGELOG.md
fixes spec: using valid params so the paginator can produce an url
fixes spec: pass current page number to paginator