Initial working version
strip non-digit, non-alpha characters, allow for multiple delimiting characters
Convert also Unknown PGN
Initial version
Make PGNs an object instead of an array, same for EnumValues, add Makefile support
Merge @tkurki changes, but:
- Make camelization dependent on new flags -camel or -upper-camel.
- Fix camelization of repeating fields.
Don't set id, but generate

 "CamelCaseDescription":{ .... }

for each PGN when -camel or -upper-camel is generated.
Merge pull request #14 from timmathews/master

Tim Mathews sent in some improvements:

Fusion PGNs
Improvement to PGN 130312 "Temperature" (lookup table added)
Improvement to PGN 130313 "Humidity" (NMEA corrigenda based)
Improvement to PGN 130315 "Set Pressure" (NMEA corrigenda based)
Document -json [-camel | -upper-camel]
Merge branch 'master' into generate-json
Delete extra flags for now, add pgns files.
Fixes #16

Chicken out by just not using a comma in the lookup value.
Merge pull request #15 from tkurki/generate-json

Generate pgns.json
Commit the fixed pgns.json and pgns.xml with the fixes from issue #16.
Add some debugging, fix some minor json output stuff
Push util files to /usr/local/bin on install
Fix correct closing brace count for JSON output
Fix correct closing brace count for JSON output
Remove PHP warnings
Add capability to set depth offset for Airmar DST 200/800 transducers