refactor to have 3 sentence types
refactor types
add manufacturer to proprietary type
fix error on truncated sentences
use coveralls
refactor again, tests for weird proprietary sentences
add tests
fixing proprietary sentence types/initialization
fix tests from #6
Merge pull request #9 from Knio/sentence_types

refactor sentence types & unify parsing for proprietary types. closes #6, closes #8, closes #10