Fixed DataConstants.
glScissor state can now be saved on a stack

This gets usefull when ClipEntities are nested
Take a union of new and old clip settings when applying glScissor
Minor change.
Added TextUtils.join.
Added SystemUtils.isNDKSupported with special case for GoogleTV.
Added ant-contrib-1.0b3.jar.
Added build.xml that allows to remove native code when -Dndk=false is supplied. This is necessary for GoogleTV without NDK support (< 4.2.2).
Updated native libraries (built with ndk r8b).
Made ndk build through ant multi-threaded.
Updated .classpath for ADT 22.
Merge branch 'GLES2-AnchorCenter' of github.com:nicolasgramlich/AndEngine into GLES2-AnchorCenter
Added ConnectivityUtils.
Added EthernetUtils, removed WifiException (using WifiUtilsException). Minor other changes.
Fixed a NullPointerException in WifiUtils.
Merge branch 'GLES2-AnchorCenter' of github.com:nicolasgramlich/AndEngine into GLES2-AnchorCenter
Added SystemUtils.hasCamera.
Merge pull request #219 from nazgee/for-nicolas-scissor-fix

ClipEntities can now be nested.
Minor changes in GLScissorStack.
Minor change.