1. import the shogun-data as a submodule. 2. add serveral lines for
gp-demo, for fetch the data from australian.libsvm.h5. 3. add a feature
on all available demos, when user press the button, when the browser do
the ajax activity, the button are disabled to get rid of the duplicate
calculation.
Merge pull request #3 from foulwall/data

correct the shogun-data submodule repo url