Update api push project with metadatacomposer extra datas. Update project's json serialization with metadatacomposer extra datas. (And remove a lot of has_key because of future python 3)
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>platform_group</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.python.pydev.PyDevBuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>com.aptana.projects.webnature</nature>
<nature>org.python.pydev.pythonNature</nature>
</natures>
</projectDescription>