DOC - CAN - fix typo
eLua - comments - include return from functions in can, i2c
elua i2c module - fix comment
platform.h - note unused constants
PLATFORM_SPI_TOTAL, PLATFORM_UART_TOTAL, PLATFORM_PWM_TOTAL

TODO: Figure out purpose, or remove them
LM3S - startup_gcc.c - human readable error messages for default ISRs
also, use ROM versions of UARTCharPut, if available
LM3S - startup_gcc - use console UART, rather than assuming UART0
LM3S - platform_int - use platform_pio_get_num_pins rather than assuming 8 pins per port
LM3S - platform.c - MAP_ - Use ROM versions of library if available
LM3S - platform.c - remove duplicate include
Merge pull request #45 from ecdr/MiscUpdates

Misc updates