spec: Add Leon to credits

spec: ticket 281: clarify VLAN PCP handling

The VLAN PCP field should be ignored if the VLAN ID field is wildcarded
or if the VLAN ID field is set to NONE.

pipline_flow: add clear actions instruction

Add the "Clear Actions" instruction as an instruction that updates the
action set.

Addresses ticket: 228

spec: Remove redundancy

spec: replace "an flow" with "a flow"

spec: set ecn action

docs: Update ChangeLog to include 1.0.0 information

spec: change version to indicate release candidate

spec: change version to indicate release candidate

Change package version to 0.8.9-rev4