New module: deegree-core-gdal. Provides common functionality for accessing GDAL via JNI.
New module: deegree-tilestore-gdal. Tile store implementation based on GDAL.
New module: deegree-layers-gdal. Layer implementation based on GDAL.
Work on GDAL-chapter for handbook
Cleanup and finishing of GDAL chapter
Merge pull request #249 from occamlabs/3.4-feature-gdal-dataaccess

GDAL integration and dataaccess modules