Don't assume location of make_css.

make_css might be installed elsewhere to the mapit package, so import
that to find out where it actually is. Specify the two scripts correctly
in setup.py.
Rename scripts for safer installation.

If MapIt is installed from PyPi, its scripts might go in some central
bin directory, so probably should be named uniquely for clarity.
Link postcode to GeoHack page (fixes #78).
Version 1.0.1.