issues #2893:
  1.Texture atlas are create on demand, based on the characters used in the label.
  2.Create Quads (and not sprites) for each letter.
[sp v25] Updating SpiderMonkey library to FFv25.
[sp v25] Fixing complication errors after updating Spidermonkey to v25.
[sp v25] Updating auto-generated and bindings-generated submodules.
[sp v25] Debugger script, loading file is ok.
[sp v25] Updating Debugger script.
[sp v25] Removing unused comments in main.js
[sp v25] Don't use 'using namespace std;' to make android build happy.
issue #2826: Updating vs project to link mozjs-25.lib
issue #2826: Bug fixes after using Spidermonkey v25.  Adding JSB_AUTOCOMPARTMENT_WITH_GLOBAL_OBJCET macro.
issue #2826: Bug fixes for win32.
issue #2970:crash for CCLabelTTF when setting dimension width less than the font height
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into developLabelTTF
issus #2893:improve new label
issue #2893:improve new label
issue #2826: Updating ScriptingCore.cpp. runScript small fix.
Merge pull request #4030 from dumganhar/spv25

[sp v25] Updating SpiderMonkey library to FFv25.
Adds flags in  GLProgram to prevent sending uneeded uniforms
Merge pull request #4038 from ricardoquesada/perf_glprogram

Adds flags in  GLProgram to prevent sending uneeded uniforms
Merge pull request #4037 from samuele3hu/developLabelTTF

issue #2970:crash for CCLabelTTF when setting dimension width less than the font height