add empty news boiler plate
added PCA+KMeans in KMeans notebook
minor changes in PCA in KMeans notebook
Merge pull request #1872 from mazumdarparijat/KMeans_notebook

added PCA+KMeans in KMeans notebook
apply_to_feature_matrix method fixed in PCA
PCA unit test added
PCA code changes fixed
fix install of r_static/modular interfaces when DESTDIR is set
add another missing DESTDIR
ssk renamed to SubsequenceStringKernel for naming consistency
Merge pull request #1879 from lambday/develop

ssk renamed to SubsequenceStringKernel for naming consistency
PCA in-place
updating revision of data submodule
data submodule update
data state updated after merge
PCA unittest added/PCA code minor changes
PCA unit-test divided into small parts
minor corrections in comments
proper error messages
some modifications to  make this at least compile.