Add script to insert CSS rule dynamically

for function to switch
* All messages
* Only Messages which I post
* Only Messages which Mention to me
Fix 'this' to dynamicStyle
insert, delete, and functions for show only mine/mention
Fix syntax error
Fix errors reported by jshint
complete function to change css dynamically
Add selector to chatSendTool
Merge pull request #1 from da0shi/feature/message-filter

Feature/message filter