Merge pull request stylus#2484 from stylus/fix-bug-in-hash-access

Fix bug in hash access

Version

merge dev

History up + version bump

Merge branch 'dev'

* dev: (21 commits)
  Fixed History for 0.54.0
  History up
  Evaluate variables in current-media function. Fixes stylus#2128
  Undesired spaces with partial reference selector using ranges. Fixes stylus#2133
  Slightly clarified an issue with combinators at ranges in partial references, re: stylus#2134
  Validate regexp flags for match function
  Fix bug with evaluating default arguments
  Undesired spaces with partial reference selector using ranges. Fixes stylus#2133
  Fixed bug with selectors() function. Closes stylus#2130
  Don't parse empty imports
  Wrong errors with --include-css and --resolve-url used concurrently. Fixes stylus#2125
  misc fixes
  Docs and History up
  SelectorParser: Added initial reference selector
  BIFs: expose "url" function by "embedurl"
  Updated history
  Bump version
  BIFs: Added "index" function
  Updated docs that where merged incorrectly
  added a slice function
  ...