fixes jangaroo-libs part of JOO-86
"Allow EXML plugins to access their hosting component"
http://jangaroo.myjetbrains.com/youtrack/issue/JOO-86

Implement class ext.config.plugin, which is now the default to inherit
from when no explicit super class is given in an EXML plugin.
This class provides the "component" config option.
Merge branch 'jangaroo-1'
bump jangaroo-tools version to 2.0.12
fixes LIBS-63
"Jangaroo 2 SDK does not contain libs and meta folder"
http://jangaroo.myjetbrains.com/youtrack/issue/LIBS-63

Since in Jangaroo 2, there is no longer a "jangaroo" dependency type,
no JARs were found. To distinguish Jangaroo JARs from Java JARs,
I declare the jangaroo-distribution dependency as "runtime" and only
treat compile-time dependencies as Jangaroo JARs.