Fixed a typo.
drop member init
s/Virtual/virtual/
Fixed a typo.
Merge pull request #87 from hiroshi-manabe/typo-ka

Fixed a typo.
Merge pull request #88 from tzik/lower_case

s/Virtual/virtual/
Merge pull request #89 from hiroshi-manabe/typo-bun

Fixed a typo.
Merge pull request #90 from tzik/member_init

drop member init