stops ResourceWarnings for unclosed files
stops ResourceWarnings for unclosed files

Closes files bdatfile and bdatmetafile.  This seems to be the simplest way to accomplish this.

This solves warnings like this:
```
/.../lib/python3.4/site-packages/mpl_toolkits/basemap/__init__.py:1087: ResourceWarning: unclosed file <_io.TextIOWrapper name='/.../lib/python3.4/site-packages/mpl_toolkits/basemap/data/gshhsmeta_c.dat' mode='r' encoding='UTF-8'>
  self._readboundarydata('gshhs',as_polygons=True)
/.../python3.4/site-packages/mpl_toolkits/basemap/__init__.py:1095: ResourceWarning: unclosed file <_io.BufferedReader name='/.../lib/python3.4/site-packages/mpl_toolkits/basemap/data/gshhs_c.dat'>
  self._readboundarydata('gshhs',as_polygons=False)
```

ResourceWarnings are most of the warning raised when running test.py.
matplotlib/basemap,matplotlib/basemap,guziy/basemap,guziy/basemap