Merge branch 'development' of github.com:jsgirls/jsgirls.org into development

* 'development' of github.com:jsgirls/jsgirls.org:
  optimize image
  Add banner pasonatech
  Add mentor ww24
Merge branch 'master' into development

* master:
  typo
  Fix number of tutor for Sapporo#1