- add params to vehicle_minutestocharge
- add #define for charge voltage assumed by ACC
- add CTP SMS command
- add timestamp to STAT SMS command
- generalize timestring_to_mins
- TR: CTP uses CAC100 for better resolution
- TR: move MinutesToChargeCAC code into vehicle_teslaroadster_minutestocharge
Merge pull request #124 from tomsax/tws-ctp-taper

Tom Sax work batch:
 - add params to vehicle_minutestocharge
 - add #define for charge voltage assumed by ACC
 - add CTP SMS command
 - add timestamp to STAT SMS command
 - generalize timestring_to_mins
 - TR: CTP uses CAC100 for better resolution
 - TR: move MinutesToChargeCAC code into vehicle_teslaroadster_minutestocharge
 - TR: separate taper profiles for each charge mode