v0.8.4

Enhancements:

• Add separate expiration setting per rollup level (#27)
• Support exclusions in profile filter (#28)
• Flame graph should display filtered profile (#29)
• Add simple API for use directly in monitored apps (#31)

Bug fixes:

• Exception when creating/viewing some mbean gauges (#25)
• Result limit selection is not displaying the current value (#26)
• Exception when filtering traces using 'Does not contain' (#30)