updated iHate plugin to replace hardcoded regex system in favour of more flexible queries
changed config layout of iHate plugin to a simpler system
updated unit test for ihate plugin accordingly
updated docs for ihate plugin accordingly
Merge pull request #486 from BrainDamage/master

Added support for queries in iHate plugin as opposed to hardcoded regexes
style fixes for ihate (#486)
changelog/thanks for #486 (close #398)
ihate: fix singletons (from #486, fix #411)
fix ihate tests
dbcore: flexattr deletion (fix #530)
Merge branch 'master' of https://github.com/sampsyo/beets