Update app.req

Added:
SuD is "System under Development (thindeck itself)".

according to https://github.com/yegor256/thindeck/issues/15#issuecomment-40929673
SRS cleaned
#master: link to elastic beanstalk
#master: travis config
#master: link fixed
#master: 404 page
#master: typo
#master: requs 1.6
requs 1.6.1
#master: requs 1.6.2 and new seals
#78

updating main.req in accordance with #78