Add xz compress sample log

	new file:   trace/net.sf.milkfish.systrace.android.ui.test/testdata/Android_4.4_KitKat_kernel_3.10.30/cpu_bench/sched_irq_05.log.xz
	new file:   trace/net.sf.milkfish.systrace.android.ui.test/testdata/Android_4.4_KitKat_kernel_3.10.30/cpu_bench/sched_irq_06.log.xz
	new file:   trace/net.sf.milkfish.systrace.android.ui.test/testdata/Android_4.4_KitKat_kernel_3.10.30/cpu_bench/sched_irq_07.log.xz
Add org.tukaani.xz to feature

Add xz compress file support

	modified:   lib/com.fasterxml.jackson.test/src/com/fasterxml/jackson/test/xz/XZSeekDecDemo.java
	modified:   trace/net.sf.milkfish.feature/feature.xml
	modified:   trace/net.sf.milkfish.systrace.core/META-INF/MANIFEST.MF
	modified:   trace/net.sf.milkfish.systrace.core/src/net/sf/milkfish/systrace/core/cache/TraceCache.java
	modified:   trace/net.sf.milkfish.systrace.core/src/net/sf/milkfish/systrace/core/cache/TraceLoader.java
	modified:   trace/net.sf.milkfish.systrace.core/src/net/sf/milkfish/systrace/core/service/impl/SystraceService.java
Fix event parse for xz file format

	modified:   trace/net.sf.milkfish.systrace.android.core/src/net/sf/milkfish/systrace/android/core/AndroidTrace.java
	modified:   trace/net.sf.milkfish.systrace.core/src/net/sf/milkfish/systrace/core/cache/TraceCache.java
	modified:   trace/net.sf.milkfish.systrace.core/src/net/sf/milkfish/systrace/core/service/impl/SystraceService.java
Remove unused import

	modified:   trace/net.sf.milkfish.systrace.core/src/net/sf/milkfish/systrace/core/cache/TraceCache.java
	modified:   trace/net.sf.milkfish.systrace.core/src/net/sf/milkfish/systrace/core/service/impl/SystraceService.java
Add todo

	modified:   trace/net.sf.milkfish.product/Todo.txt