Major syntax overhaul: function arguments are now enclosed in parentheses and are not separated from the function name by a colon. String arguments should now be enclosed in either quotation marks or apostrophes. Numerical arguments should not have quotation marks or apostrophes around them. Add support for ternaries i.e. short-hand if/then/else constructs. Whitespace is now supported without escaping in strings.
Change the email checking regex to a much simpler one as in 99.9% of cases the extremely complex regex we used before is not necessary. Update release files.
Fix a bug in the validation functions that caused an error on IE7. The cause was probably the unquoted property name 'in' which IE7 interprets as a keyword.
Update version number. Add a changelog to the README. Update README.md. Add a warning about the recent rule string syntax changes to the top of the README.