Add implementation of suffix tre algorithm for document clusterin

Signed-off-by: Krzysztof Opasiak <ups100@tlen.pl>
 Add some tests to check tree build procedure

Signed-off-by: Krzysztof Opasiak <ups100@tlen.pl>
sample datas
Remove additional debug

Signed-off-by: Krzysztof Opasiak <ups100@tlen.pl>
some 'metadata'
Add first stage of labels generation. Move code to notebook due to JVM issues.

Signed-off-by: Krzysztof Opasiak <ups100@tlen.pl>
Temporary version. Testing, looking for error

Signed-off-by: Krzysztof Opasiak <ups100@tlen.pl>