Drop packet if there are not enough free buffers to perform fragmentation
Improve csma debug traces
Add per neighbor packet throttle
Add function to change I2C baudrate and push relevant configuration values to platform config
Merge pull request #825 from alignan/i2c_changes

Add function to change I2C baudrate and push relevant configuration valu...
Merge pull request #648 from cetic/pr-csma-fixes

High throughput fixes for csma and sixlowpan
Merge commit '6fb7dd238e0421849cc3a8bee71d3e4491b2b1a7' into HEAD