Disable method length style cop for Integer#to_roman
Disable TrivialAccessors cop for class7 exercises2-5
Improve class8 exercises
Fix class8 exercise7 spec
Improve class style guide
Improve class style guide
Improve class style guide
Improve class style guide
Improve class style guide
Fix Class style guide
fixed merge conflict
class7 assignment2
class7 assignment3
class7 assignment4&5