build and publish the command line utility

# Conflicts:
# Makefile

ability to provide secret to agent and generate token

agents stream logs using websockets

fix issue with incorrect build status environment variable

bump version number, auto-pull new plugins, process http_proxy vars

Fix Makefile build on OS X

ability to limit log size, defaults to 5mb

add event to the context of status set in github

enabled when status change clause

CLI commands for listing agents, queue items

ability for agent to ping central drone server

ability to get team list from Gogs

Image optimize [CI SKIP]

fix a typo in queue.go [CI SKIP]

added scopes to the oauth2 config

quick hack to group log output by step

added query, endpoint, cmd to list builds in queue

fix(typo): sqite3 -> sqlite3

store yaml verification and signature in build

updated yaml signature

refactored build runner, enables drone exec command

migrate almost all CLI commands to core

change script to pipeline per feedback

update docker plugin storage driver

Migrate yaml to 0.5

significant improvement to GitHub remote coverage (from 5% to 50%)

refactoring github package to increase test coverage

TYPO: plguins != plugins

bump 0.5 version

bump docker version to 0.4.2 in preparation for 0.5

add matrix include capability

Replace configuraiton by configuration in router/middleware/remote.go

obvious fix

implemented 0.5 in-memory stream multiplexer