So I was getting an error on Serial1.println when compiling based on the develop branch. I corrected this by changing line 34 of spark_wiring_usartserial.h from
class USARTSerial : public Stream
class USARTSerial : public Print
I was getting a semantic Error on that line of “Stream is ambiguous” It also caused the println function to be unresolved. This was the best way I could determine to fix the error but there may be a better way. Just sharing for future users. Probably not an issue for users compiling from WEB IDE Build but for anyone compiling from the latest develop branch locally it might be helpful.