Releasing new version 0.8.0

CHANGELOG.md

-Upcoming version:
------------------
+Version v0.8.0:
+---------------
   - using srtm1 dataset by default now (Nikolaus Krismer)
   - upgrading to latest postgresql and postgis version (Nikolaus Krismer)
   - updating dropTables to use CASCADE (Nikolaus Krismer)