mapbox / mapnik-omnivore / 846

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CSV error message handling (#161)

* add test for bad header csv

* add try catch around new mapnik.Datasource

* add fixture with empty header column

* add substr to shorten message

* add try/catch statement

* add slice to truncate error message

* add tests for empty and wrong headers

* add fixture with empty header column

* add fixture without detectable headers

* add valid csv fixture

* return nice error for csv column headers

* semicolon

7 of 7 new or added lines in 2 files covered. (100.0%)

503 of 529 relevant lines covered (95.09%)

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