add lessen1
Merge branch 'master' of github.com:satooshi/scala-lessen

Conflicts:
	.gitignore
add lessen 2
add lessen 3
add comment
refactor lessen 3
change side effect method style
add while and do-while
add lessen 4
improve lessen 1_1
rename
use for expression
improve lessen4
improve lessen5
refactor lessen 5
refactor lessen5
add description
rm timer
add description
rm idea dir