CSS Parser Code

fix: CSSStyleSheet.insertRule now takes care of incorrect rules. If the rule (to be added) parsing failes, insertRule now throws an exception (instead of adding a null as rule).

% small code optimization

add the date of the 0.9.6 release

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] copy for tag cssparser-0.9.6

[maven-release-plugin] prepare release cssparser-0.9.6

update scm url

rollback failed 0.9.6 build

rollback failed 0.9.6 build

[maven-release-plugin] prepare release cssparser-0.9.6