4.1.0 - Performance Improvements

4.1.0 - Performance Improvements
Changes from previous version:
Fixes

• Reimplemented (and fixed) the universal newlines: now the sequence
  \r\n and \r are replaced by \n correctly.
• Removed a hardcoded delay when sending something to the underlying
  interpreter. Before was a delay of 0.01 secs, now it is disabled.
  See eb37d35.

Enhancements

• Cached the compilation of the regexs avoiding calling re.compile
  more than once for a regex.
  The improvement is small as re.compile already has a cache for this
  but it is better to cache ourselves in case we want to change the
  regex engine (Python's re module for now)
• Refactor of internal ExampleParser's methods allowing to change the
  meaning of things like 'whitespace' or 'ellipsis'.
• Do not delay the sending of input to the interpreter; make it as
  faster as possible. Before was a delay of 0.01 secs, now it is
  disabled. See eb37d35.
  If needed, the flag 'delaybeforesend' can control this delay (none by
  default) from the command line (-o option) or from the example's
  options string.