v0.3.0

parseLatex v0.3.0

• Added stdbool.h to the includes for compatibility with older
  gcc. (Thanks to Dirk Eddelbuettel for the report and PR #2).
• Added a configure script to check for bison (on Unix-alike only).
• Adjacent math environments were treated as a syntax error.
• \let is now handled the same way as \def: the next two
  tokens are not considered for evaluation.
• Added arguments defcmd and defenv to parseLatex() to
  allow the user to specify defining macros. These names
  are also now allowed in the magic comments.
• Spaces between a verb macro and its argument caused the parsing
  to be incorrect.
• Added argument recover to parseLatex(), to attempt to recover
  after a parsing error. This may help with diagnosing the error.
  The error will be wrapped in an ERROR tag which is displayed
  as >>>text causing error<<<.