Release 4.0.2: bug fixes

This release collects together the bug fixes that have been applied since release 4.0.0. The following issues have been addressed:

#97: Fix floatOpt function so that it actually works
#100: stm32f4xx_can doesn't build correctly
#103: SPI Timing issue
#105: Fix cmake example
#106: Update 'new' signature
#108: Ethernet PHY Support (for the LAN8710A)
#112: Switch htons -> ntohs in UDP example
#113: Support for the Tianma TM032LDH05