Added basic support for logging with log4j.

Defined Rascal extension point.
Part-written (and commented out) code to integrate Rascal extension points in ExtensionMetricProviderManager.java
Added extra constructor to Date to create from an epoch (as Git uses epochs for commits)

git-svn-id: https://svn.cs.york.ac.uk/svn/ossmeter/Software/source@385 1b171192-1bc4-4300-84b6-1b6fde2e8ce3

jw@CS.YORK.AC.UK jw@CS.YORK.AC.UK 2013-05-08

added platform/org.ossmeter.platform/schema/org.ossmeter.platform.metricprovider.rascal.exsd
added platform/org.ossmeter.platform/src/org/ossmeter/platform/logging/OssmeterLogger.java
added platform/org.ossmeter.platform/src/org/ossmeter/platform/logging/OssmeterLoggerFactory.java
changed platform/org.ossmeter.platform/META-INF/MANIFEST.MF
changed platform/org.ossmeter.platform/src/org/ossmeter/platform/Date.java
changed platform/org.ossmeter.platform/src/org/ossmeter/platform/ExtensionMetricProviderManager.java
changed platform/org.ossmeter.platform/plugin.xml
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platform/org.ossmeter.platform/src/org/ossmeter/platform/logging/OssmeterLogger.java Diff Switch to side-by-side view
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platform/org.ossmeter.platform/src/org/ossmeter/platform/logging/OssmeterLoggerFactory.java Diff Switch to side-by-side view
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platform/org.ossmeter.platform/META-INF/MANIFEST.MF Diff Switch to side-by-side view
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platform/org.ossmeter.platform/src/org/ossmeter/platform/Date.java Diff Switch to side-by-side view
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platform/org.ossmeter.platform/src/org/ossmeter/platform/ExtensionMetricProviderManager.java Diff Switch to side-by-side view
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platform/org.ossmeter.platform/plugin.xml Diff Switch to side-by-side view
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