apps/builtin/exec_builtin.c: Try posix_spawn if builtin apps do not have have an entry point.
apps/Application.mk: introduce MODULE config to simplify tristate(m)
apps/nsh: Change the nuttx shell module type to tristate
apps: Add loadable application support
script/mksymtab: Generate symbol table name by default
apps/builtin: Allow loadable applications can register with apps/builtin.
Added a simple reader example for the LIS3DSH acceleration sensor on STM32F4Discovery
* Added a simple reader example for the LIS3DSH acceleration sensor as
found on STM32F4Discovery.
* Edited lis3dsh_reader_main.c to obey nuttx coding standard.
Approved-by: Gregory Nutt <gnutt@nuttx.org>