v0.13.0-beta.2

Changelog

a3e38be Do not join absolute paths on build messages (#1294)
ae0038b Fix WorkerStop event and add WorkerStart event (#1318)
75f58c3 Fix error texts (#1317)
103e0ce Fix the alpine-based Docker image (#1297)
131515d adding charset=utf-8 to Content-Type header for html documents (#1314)
4c0665b adds consts for events (#1315)
9fd04c9 cleaned up to use better events helper methods
01958bf currently the Dockerfile.build is broken because it isn't install the (#1306)
a75e7bc does a better job of rebranding refresh: events as buffalo:dev: events (#1321)
45cf96e emit better payloads (#1311)
9bd87bf fixed a cast issue and some issues with go mods (#1320)
b9bf961 fixes failing tests on travis (#1308)
197ef54 implements an event system for Buffalo (#1305)
18a785a improve deprecation notices (#1307)
93538a2 makes sure that both Dockerfile.build and Dockerfile get the latest (#1313)
3314bc5 reset version back to development
7921bc3 see russross/blackfriday#491 (comment) (#1319)
5569c4b this re-brands refresh events as buffalo:dev events. it also fixes a (#1309)
4cc60cf updated events (#1316)
c9861ae version bump: v0.13.0-beta.2