Merge pull request #201 from nazgee/for-nicolas-sounds

Added API to manage sound priorities.
Move ExpireParticleIntiializer.
It may be placed under wrong package.
Merge pull request #202 from yhuiyang/upstream-moveExpireParticleInitializer

Move ExpireParticleIntiializer to initializer package.
Added cheskstyle config file.
Fixed about a million checkstyle complaints.
Merge branch 'GLES2-AnchorCenter' of github.com:nicolasgramlich/AndEngine into GLES2-AnchorCenter
Added MethodNotFoundException.
Minor refactoring in SystemUtils.
Added WifiUtils (experimental).
Moved/Merged WiFiUtils, IPUtils and Bluetooth from AndEngineMultiplayerExtension to AndEngine.
Fixed case of WifiUtils.java.
Fixed a few Exceptions not extending from AndEngineException.
Merge branch 'GLES2-AnchorCenter' of github.com:nicolasgramlich/AndEngine into GLES2-AnchorCenter
Minor changes.
Added UUUIDManager.
Added char based DataConstants.
Fixed a few chackstyle complaints.
Merge branch 'GLES2-AnchorCenter' of github.com:nicolasgramlich/AndEngine into GLES2-AnchorCenter
Moved DataConstants to proper package.
Fixed a few checkstyle complaints.