issue #1712: Adding getting dpi support for iOS and Android.
issue #1712: Adding win32 support.
issue #1712: Moved CCDevice.cpp to platform/win32.
issue #1712: Getting DPI support for Blackberry.
issue #1712: Updating project setting for blackberry.
issue #1712: Adding empty CCDevice.cpp for linux, mac and marmalade.
issue #1712: Getting DPI support for Linux.
fixed #1712: Adding default dpi for marmalade and mac since i don't know how to get DPI for these platforms.
issue #1712: DPI return integer on android.
jfloat --> jint.
fixed #1712: fix an issue of lacking table view cells after touch ended.
issue #1712: Moving getDPI from Cocos2dxActivity to Cocos2dxHelper.
fixed #1712: Updated iOS template.
issue #1712: Removed importing some unused packages in Cocos2dxActivity.
Merge pull request #1987 from dumganhar/iss1712-dpi

fixed #1712: Adding a class named "CCDevice" and getting DPI suport for Android, iOS, Win32, Linux, Blackberry.
issue #1724: Adding HelloJavascript project.
issue #1724: fixed errors for HelloJavascript of win32 port.
fixed #1724: Adding HelloJavascript for VS2012 solution.
fixed #1724: Updated project dependence for HelloJavascript project.
Merge pull request #1988 from dumganhar/iss1724-hellojs

fixed #1724: Adding HelloJavascript project.