updated debug info for clarity, re-worked sendCommand to not cutoff response data when a responseCheck was successful
expand out SerialModem methods for re-usability
refactor SerialModemClient to remove endTransmit hack
platform def for arduino delay
re-work driver interface for better tcp socket handling
fix for older IDE compile errors
added response_check struct with slight refactor of getResponse, updated sim5218 for internal buffer parsing of socket writing for a speed boost, namespaced everything under Modem
remove unused/legacy readLine
simplify sendBasicCommand
change how response_check_t handles data
add Leonardo example
__PROGMEM_STR constructor is now explicit for error-checking
rename response_check_t & change it to hold char * refs
remove unused namespace using
update legacy response_check_t to use new progmem standards
refactor of progmem string handling
disable internal debug
Merge branch 'master' into attm2x-master