Updated to CoAP Proposed Standard and removed draft versions.
Renamed erbium to er-coap to avoid confusion and have a meaningful directory name.
Used Uncrustify and fixed Travis build errors.
Added function for easy block1 usage.
Fixed blocksize calculation when REST_MAX_CHUNK_SIZE != 2^x.
Added example for block1 + separate + block2.
Enabled forcing CON packet for observer notifications each 20 packets
Updated Cooja simulations.
Updated README and Makefile.
Update to observe-13 (cancellation).
Removed references to missing DTLS implementation.
Merge pull request #507 from mkovatsc/coap-18

Erbium CoAP cleanup for Proposed Standard version