packaging: Update debian repository README
packaging/tinyos-tools: add default-jdk to dependencies

- on clean installs (fresh Ubuntu 14.04 for example), installing msp430-46
and tinyos-tools fails.  tinyos-tools is looking for a JNI environment
and can't find it.

If default-jdk is installed this problem goes away.
packaging/msp430-47: remove msp430-47-gdb from dependencies

gdb doesn't work in the 47 toolchain.  Needs lots of work.  Isn't worth
it.  The RedHat/TI gdb 4.9 toolchain will surplant so any time spent on
the 4.7 gdb is a waste.   And the problems are non-trivial.
added packaging scripts for new avr toolchain
removed avr-46. It was never used, just an old attempt to update the toolchain
fixed dependencies
strip binaries before packaging
removed unused buildscript