stringr 0.3
===========

 * fixed() now also escapes |
 * str_join() renamed to str_c()
 * all functions more carefully check input and return informative error
   messages if not as expected.
 * add invert_match() function to convert a matrix of location of matches to
   locations of non-matches
 * add fixed() function to allow matching of fixed strings.

stringr 0.2
===========

 * str_length now returns correct results when used with factors
 * str_sub now correctly replaces Inf in end argument with length of string
 * new function str_split_fixed returns fixed number of splits in a character
   matrix
 * str_split no longer uses strsplit to preserve trailing breaks