applied vert.x 2.0.0
- added API GET /user/avator to obtain user avator image
- added API POST /user/change_avator to change user avator
- added to support session id transfering way, cookie, multipart body
  attribute
- fixed issue that response status code does not work
fixed below issues:
- can not obtain messages when search condition 'futureThan' or
  'pastThan' were assigned.
- 'ok' was returned when authentication was failed.
added API to change password.
changed group id symboll from @@ to $.
fixed the problem the message sent by myself was not obtained
immediately.
delayed to notify server changes to others(except for person himself)
fixed issue can not obtain results more than 100 from database.
limit 200 messages per request when 'count' was not assigned.
added notification when message was removed.
added search condition "reply_to"
Merge pull request #13 from haushinka2dx/conversation

/messages/search に reply_to を検索条件に指定可能に
Add jasmine
Merge pull request #16 from haushinka2dx/jasmine

#12 add jasmine for test
enabled multiple logins by the same user. max is 10.
constantized maxConnectionsPerUser.
replaced mod-auth-mgr to latest version.
Merge pull request #21 from haushinka2dx/multi-login

enabled multiple logins by the same user. max is 10.
add sinonjs for mock
test and refactor of time_format.js
関数名を変更