Some documentation for lda

minor changes to 'Tutorial.md'
Added 'cmd-tips.md' as a place to put useful commands that I know I (we) won't remember but I don't want to have to go Googling for them
Added 'deploy_to_aws.md' which is my notes on how to deploy an LDA app to aws
Merge branch 'master' of https://github.com/FityFity/docs