Release 1.8.0 - Oct 10 2015

Changes

• New algorithm for handling variable tags (<get>, <set>, <add>, <sub>,
  <mult>, <div>, <bot> and <env>) that allows for iterative nesting of
  these tags (for example, <set copy=<get orig>> will work now).
• Fix sorting algorithm, so triggers with matching word counts will be
  sorted by length descending.
• stream() function can accept a multiline string instead of an array
• Speed optimization by precompiling as many regexps as possible (what was
  especially helpful was to precompile substitution and simple trigger
  regexps), taking the time-to-reply for the default brain from ~0.19s down
  to ~0.04s
• Add support for ! local concat option to override concatenation mode
  (file scoped)
• Fix the regexp used when matching optionals so that the triggers don't match
  on inputs where they shouldn't. (RiveScript-JS issue #46)