Release script no longer tries to keep copies of the ChangeLog and TODO list in the Documentation directory

STM32F4 Discovery:  Rename most everything in the board source directory to conform with the ever evolving naming standard

NSH:  Add a break command; if-then-else and looping behavior can not be configured out of the build for small systems that need minimal scripting capability

NSH:  Loosen up if-then-else-fi syntx so that a command can be on the same line as the 'then' and 'else' tokens.  This allows, as an example, 'if true; then echo true; else echo false; fi' which is much more bash-like

NSH: Separate command line parsing from command execution.  Add support for multiple, semicolone separated commands on each line

Remove all configuration variable documentation from configs/README.txt and Docuemntation/NuttXPortingGuidle.html.  The current NuttX configuration is documented in Kconfig files and in Documentation/NuttXSonfigVariables.html.  The older configuration variable documentation is not being maintained and, hence, is a liability

Add board support infrastructure for the pcDuino board.  There is not much there on the initial checkin

LM: Don't initialize .data if running in SRAM.  Global missing intialize type.  SAMA5 NAND: Fix for read nand in smaller chunks