add session_sticky_modules for tengine
Merge pull request #205 from dinic/session_sticky2

add session_sticky_modules for tengine
added the CHANGES for tengine-1.4.4
Merge pull request #206 from yaoweibin/tengine-1.4.4-2

added the CHANGES for tengine-1.4.4
bumped version to tengine-1.4.5
Merge pull request #207 from yaoweibin/bump-tengine-1.4.5

bumped version to tengine-1.4.5
Merge remote-tracking branch 'origin/master' into session_sticky

Conflicts:
	docs/modules/ngx_http_upstream_session_sticky_module_cn.md
	src/http/modules/ngx_http_upstream_session_sticky_module.c
	tests/nginx-tests/cases/session_sticky.t