Merge pull request #18 from PrintFleet/master

Support SNMPv1
1.0.17
Export PduTypes, DataTypes and (new) Versions and Error constants
Add support for encoding data types: OID, TimeTicks, and Counter
Allow skipping validation when encoding value OIDs
Fix paths in test files
Add tests for encodeTimeTicks, encodeCounter, encodeOid(skipValidation=true)
Merge branch 'feature/additional-encoding'
Merge branch 'feature/export-types'