nrf51822: Remove local flasher

This patch removes the local flasher for the nRF51822 platform. This
flasher requires an old version of the J-Link software and adds an
dependence in the Makefile.platform.

Now it is recommended to use a new tool called `nrftool` to program the
nRF51822. This tool is a python package and can be installed using pip:

	$ [sudo] pip install nrftool

Or it can be downloaded at https://pypi.python.org/pypi/nrftool
build: Build blestack as a static library

Now all examples are linked against libblestack.a, which is built using
the root Makefile.
build: Print output of size after build
build: Replace FLASHER by PROGRAMMER