Sould fix projection issue mentioned in #12
Update license for 2014 data
Add 2014 data, upgrade topojson
LV03 also for 2014 source data
Ignore zip dir
Bump topojson dependency
Add PLZ data, rename zip/ to downloads/
Add PLZ topojson
Treat all targets as secondary

See http://www.gnu.org/software/make/manual/make.html#index-preserving-with-_0040code_007b_002eSECONDARY_007d-234
Remove need for top-level tmp dir
Use topojson-group
Remove tmp
Merge lakes
Use two passes: first create unscaled topologies, then combine + scale + simplify. Fixes #7
Of course, we can also combine layers directly from the shapefiles. No need for multiple passes through topojson!
Merge fix