fixed presentation
fixed presentation.md
Merge pull request #60 from ICTKyouikukei2013/ichiren/presentation

Ichiren/presentation
fixed presentation.md
Merge pull request #61 from ICTKyouikukei2013/ichiren/presentation

fixed presentation.md
add pictures
fixed Mahara_logo.png
fixed presentation.md
Merge pull request #62 from ICTKyouikukei2013/ichiren/presentation

Ichiren/presentation