Added missing include of contiki-conf.h
Load Makefile.target for slip-radio

This loads Makefile.target into Makefile so we can check for TARGET==sky
when building this. Compilation for sky fails without it.

Signed-off-by: Johannes Gilger <heipei@hackvalue.de>
Makes RPL Initial Link Metric configurable
Bug fix: changed the macro RPL_LOLLIPOP_INCREMENT to update the counter instead of returning the new value since this is how the macro is used today.
add_timer() does not set owning process
one blank less
Add some debug PRINTFs for RPL_LEAF_ONLY mode.
cpu/avr: Make sure that GCC removes all unused symbols.

This magic comes from the `--gc-sections` linker flag, which turns on garbage collection for unused input sections. The compiler flags `-ffunction-sections` and `-fdata-sections` make sure that each function and each static data definition have their own section. The result is that GCC can prune away all unused symbols, reducing the size of the resulting executable.

These optimizations may be disabled by setting the Makefile variable
`SMALL` to zero.
httpd-simple-avr: 'isused' seems to not be used anymore.
Merge pull request #133 from darconeous/pull-requests/cpu-avr-gc-sections

cpu/avr: Make sure that GCC removes all unused symbols.
Merge pull request #142 from malvira/rpl-leaf-debug

Add some debug PRINTFs for RPL_LEAF_ONLY mode.
Merge pull request #126 from rgrr/master

Bug fix: add_timer() does not set owning process
Merge pull request #125 from nfi/lollipop

Bug fix: corrected the macro RPL_LOLLIPOP_INCREMENT
Merge pull request #102 from cetic/rpl-conf-init-link-metric

Makes RPL Initial Link Metric configurable
Merge pull request #99 from heipei/slip-radio

Load Makefile.target for slip-radio
Merge pull request #90 from simonduq/rpl-conf

Added missing include of contiki-conf.h in rpl-conf.h
Merge pull request #137 from darconeous/pull-requests/platform-avr-ravenusb-httpd-isused-fix

Fix for avr-ravenusb target builds due to missing 'isused'.