use default values for metatiling width/height if not present in layer description
only check for possible WindowsError when unlinking file if we are in Windows
Updated quickstart
Removed preprocessing data section from quickstart
Merge branch 'master' of github.com:boundlessgeo/suite-qgis-plugin
Fixing Sphinx error
Update README.rst
changed default PG port to 5432
do not show raster metatables in PG
changed dem.tif
updated quickstart images
updated preprocessing section in quickstart