v2.4.0 - Behavioural fixes

• Improvement: click.stop listeners now used on the close and action buttons ( closes #18 )
• Improvement: Passing a duration of 0 to the component or message will not set a message timeout if the message is dismissible ( closes #17 )
• BugFix: Identical messages are no longer grouped if groups are disabled ( closes #14 )
• BugFix: Renamed browser export to umd in package.json ( closes #16 )
• BugFix: Messages not grouping properly in some circumstances
• BugFix: Moved module property from root to compilerOptions in tsconfig.json ( suggested in #16 )

Full Changelog: v2.3.7...v2.4.0