added the fifth param for ngx.re.find()#1

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lancelijade wants to merge 3 commits intoopenresty:masterfrom lancelijade:master

+9-4

Commits on Nov 8, 2013

added the fifth param for ngx.re.find to retrieve the n-th matched result's position
lancelijade
committed

Commits on Nov 10, 2013

added the fifth param for ngx.re.find to retrieve the n-th matched result's position, revised
lancelijade
committed

Commits on Nov 11, 2013

revised according collect_captures(), but don't know why
lancelijade
committed