v0.5.3

Changelog

26474d3 added handlers to view error pages, and added preliminary tests for each
fb9bd7b changed min go version to 1.11
0cd8754 changed order of conf file search, reformatted config
085744a commented and cleaned up some tests
920e2ea fixed race condition
2eb9fae goreleaser config
b365c04 indexCache is now a pointer to an indexPage
52149b3 moved config file info to a struct rather than calling fields individually
181dcaa moved error404() and error500() to handlers.go
f7699e8 new interface cacher being used
bee2bb0 on config file change, pages recache on next load