Basic structure to use shapefiles as data source

The basic buuilding blocks are in place, the issue is now implementing a generator for shapefiles
Added support for ESRI shape files

Specify shape file with the option --shp_file=/path/to/file.shp
The shape file must be a point layer in EPSG 4326 (that is lat/long, as with projection mercator)
Also added a unit test in test/test_shp_file.py and added the test to travis
Note: python-gdal bindings must be installed to support this option
Added dependencies to .travis.yml
typo
New approach at installing python-gdal
Update .travis.yml
chmod 755
add space
fix Travis setup for shape file test
try again to set Travis up for gdal test
install python3-gdal