Merge pull request #2 from darioaugusto/master

ii1 operator
Merge pull request #3 from darioaugusto/master

gOperator implementation
Spectral Features
Spatial Resolve, Group and Join
Chessboard segmentation, image meta files
Morphological features
Updated Chessboard Segmentation

Added the enabled option for the images
Baatz mutual segmentation
Updated Baatz
Thresholding segmentation
Fixed operator graph
Updated Limiarization and Baatz
Aggregations and ROIStorage
Updated segmentations and spatial operations
Fixed interpretation project paths
Added OperatorSet and PigParser