i. Ensure that artifacts in use are automatically included in the reports.
ii. Fixed the TimeStamp_Start and TimeStamp_End attributes to be seconds since epoch
Added icons for new artifacts to show up in the results tree view and the HTML report.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Core/src/org/sleuthkit/autopsy/report/ReportGenerator.java
	Core/src/org/sleuthkit/autopsy/report/ReportHTML.java
Ensure all DATETIME_* attributes are treated as integers.
Replace hard coded numbers in switch/case statements with corresponding enum values.
Merge branch 'master' of https://github.com/sleuthkit/autopsy

Conflicts:
	branding/core/core.jar/org/netbeans/core/startup/Bundle.properties
	branding/modules/org-netbeans-core-windows.jar/org/netbeans/core/windows/view/ui/Bundle.properties
Handle new artifacts/attributes for Autopsy/MPF integration.
Merge branch 'master' of https://github.com/sleuthkit/autopsy
Merge pull request #247 from raman-bt/master

Added some more artifacts/attributes for MPF/Autopsy integration