issue #1683: Adding default path to the vector of searching path.
Merge remote-tracking branch 'cocos2d-x/master' into iss1683-ccfileutils
issue #1683: Updating CCFileUtils for Blackberry and Marmalade.
issue #1683: Fixing complication errors for blackberry.
Fixing a bug in CCLabelTTF.cpp, checking the return value of CCTexture2D::initWithString.
Merge pull request #1911 from dumganhar/iss1683-ccfileutils

issue #1683: Updating CCFileUtils for Blackberry and Marmalade.