New version - 1.67v usability enchancements

This is second version release in the same day!!!

Features

1. Fontello icons for most of the icons
2. Sneek chat preview on lists. No need to accept a chat to see about what user is asking.

Bugfix.

1. After some changes up-votes and down-botes icons colors was ignored.
2. https://github.com/remdex/livehelperchat/issues/196

This is second release in the same day. Be sure that you have also executed doc/update_db/update_48.sql

execute doc/update_db/update_49.sql for update

New version - 1.66v, OAuth 2.0 to Access Google APIs, Chat close mail

This version futher enchances XMPP support, this time I have added ability to have XMPP support from GTalk just using Google APIs without requirement to enter google password.

Features

1. Now you can configure to receive an e-mail then chat is closed.
   1. First we check does mail templates has any recipients.
   2. If not then we check for department responsible users.
   3. If not we send an e-mail to admin. 
2. I have added GTalk OAuth2 support for authorisation. It allows to authorize live helper chat to send xmpp messages using OAuth logic. So you won't have to enter your password. If you are using two steps verification on google, you just have to generate application specific password if you decide to keep standard XMPP configuration, that's all.
3. Added more check for install script. mbstring and php_curl extension checks.

I will update XMPP configuration article with more detailed information how to configure XMPP and use OAuth method.

execute doc/update_db/update_48.sql for update and follow standard upgrade instructions

New version - 1.65v GTalk, XMPP, Xabber, Mono

This versions brings so mutch anticipated posibility to see notifications about new chats directly from XMPP supported apps.

Features

1. XMPP Support, you can just configure XMPP and install Xabber on your Android phone or Monal on IPhone and start to receive a new chat requests. You do not have to be online all the time, you can configure your online hours in department now also.
2. Department online hours, you can set then chat should be online automatically by week days and hours. You can also set after how many seconds new chat callback should be executed.
3. New chat request callback option. This will allow for users implement other handlers like SMS notification etc.
4. Notification about new chats either using XMPP or mail. Clicking link in mail will lead you automatically to chat.
5. Statistic page will show how many total up-votes or downvotes has received an operator.

Changes

1. Install script will show precise error.
2. Avoid language confusion in other siteaccess than site_admin.

execute doc/update_db/update_47.sql for update

Small update regarding language confusion.

Since I implemented option to have custom language for each back office user. This option was also heritaged in widget/embed windows. This got users confusing, if I generated embed code for Russian why do I see english language? It was because the app remembered what language was set in back office. Since this small update, only site_admin will remember your language and you can easily test how widget in your language looks like without switching language in back office or using other browser.

If you desperately need this there is this github commit. 

https://github.com/remdex/livehelperchat/commit/81b4a3daab46e592933aab3b3f331b780669b03c

White screen while creating pro active chat invitation.

There was a bug in install script. And during pro active chat invitation creation you could get white screen. So just execute this query:

ALTER TABLE `lh_abstract_proactive_chat_invitation`
ADD `show_random_operator` int(11) NOT NULL,
COMMENT='';

This bug in install script effected 1.63v and 1.64v.

Really sorry for this. But, bad things happens to good people :)