Version 0.7.2

• Add the PHP curl and mbstring package detection in the installation process;
• Remove time zone settings in the installation process, which is replaced by PHP system time zone settings;
• Add a free IP address resolver named IpIp.net for Chinese users (Github user 17mon had pull request);
• Improving the function of the user permission management;
• To adapt to the new version of PHP requirements,PHP is drivered by mysqli instead of the previous mysql;
• The numbers of Active user of region statistics,device types,OS statistics,resolution statistics,carriers statistics and network statistics reports are replaced by user sessions. And Top10 shows are changed from piechart to bar chart.
• Stability of other function is improved.
• Upgrading Codeigniter from version 2.1.0 to 2.2.3, and repairing related bugs of the previous framework;
• Android and iOS SDK codes are made a big changes, which will make the SDK runs more stable;
• PHP code of Web server-side also uses the PEAR coding standard code style, and adds the code comments;
• In order to improve the code quality, integrated the phpunit unit tests, and adds detailed test cases to the web interfaces.
• Add indexes for some tables to improve the performance of the query.
• Merge codes from Github Pull requests：#99，#107，#117，#146
• Fix bugs in Github：#99，#104，#105，#106，#107，#110，#111，#112，#115，#117，#119，#121，#122，#123，#127，#133，#135，#136，#139，#144，#146