test geometries and wkt encoder

[ear7h]

• added an decoder because I thought I needed it for writing geometries, turned out to be fun
  • I think the decoder needs some more tests for malformed inputs, eg. uneven parens and eof
  • the error cases were based on behavior from postgis, tested using psql -c select ST_AsBinary('POINT(0 0)'::geometry);
• added the geometries using a shell script and the code in this repo

this would close #24 #43

[coveralls]

Pull Request Test Coverage Report for Build 282

• 275 of 392 (70.15%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 57.846%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
testing/dynamic_geoms.go	3	22	13.64%
encoding/wkt/wkt_decode.go	272	370	73.51%

Totals
Change from base Build 276:	0.5%
Covered Lines:	5721
Relevant Lines:	9890

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💛 - Coveralls