added server apis
v0.1
shift-drag feature
remove unused files
supported touch devices
supported uploading PDF
modifiled styles
added icon
Merge branch 'master' of github.com:kentarokai/chat2
implemented text-input feature
Merge branch 'master' of github.com:kentarokai/chat2
added icon
Merge branch 'master' of github.com:kentarokai/chat2
added text icons
changed button styles
updated styles
implemented [circle] feature
implemented rectangle draw
added copyright
added anti-cache feature