change 'up to' and 'down to' to 'More than' and 'Less than'
raw RuleHistory model
autocompletion: new it prevents duplicates
conflict resovled
first step in modifying RuleEngine
Merge branch 'master' of https://github.com/COSI236TA/Trade_Assistant
Merge pull request #39 from COSI236TA/wenbin

Wenbin