Fixed typo

Fixed typo in a comment that sometimes appears in error messages
Merge pull request #1679 from futekov/patch-1

Fixed typo
Allow plugins to be used in stylus.render options

Allows a function or array of functions to be passed as a "use" option to the Renderer.
Merge pull request #1697 from jas/options.use

Allow plugins to be used in stylus.render options
Disable cache at REPL
Remove useless cloning of cached node
Proper filename, lineno and column information for cached nodes. Fixes #1671
Don't output sourcemap log message if --print is present
Ignore --sourcemap-base when --out is present
Add `url()` support for @namespace. Fixes #1673
Return literal CSS on parser error when --resolve-url is set. Fixes #1675
misc refactoring
Proper `@supports` parsing. Fixes #1610
Fix `@keyframes` bubbling
Fixed bug with nested media queries when one of them was declared as a variable. Closes #1678
Fixed bug with extending rules inside unknown at-rules. Closes #1681
Use LRU for memory cache. Closes #1682
Fixed bug with alpha variable for hsla/rgba. Closes #1685
Don't show JS stack trace for error() calls
Fixed bug with extending nested selector inside placeholder selector. CLoses #1687