SAM4E: Fix EMAC pin configuration.  Driver is basically functionaly now.  SAM4E-EK NSH configuration now has networking enabled by default

Support for the older, manual configurations has been completely removed from the NuttX build system

unlink/rm can now be used on nodes in the pseudo-filesystem.  There is new configuration option to suppress these costly and mostly useless operations on the pseudo-filesystem

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