Update db/schema.rb according to Rails 5
Update db/schema.rb according to Rails 5

* add_index replaced with t.index
* intiger(size 8) replaced with bigint

stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dreampet/gitlab,iiet/iiet-git,iiet/iiet-git,dreampet/gitlab,dreampet/gitlab,mmkassem/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,mmkassem/gitlabhq