camelCase methods.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1597260 13f79535-47bb-0310-9956-ffa450edef68
Finish the throwable proxy rework:
- Go back to the design that had the class and package information for a Class in a standalone class, now called ExtendedClassInfo.
- The ExtendedStackTraceElement now has a cleaner design: it holds a JRE StackTraceElement and a ExtendedClassInfo.
- The ThrowableProxy can now go back to caching ExtendedClassInfo instead of ExtendedStackTraceElement, which did to track a stack trace correctly anyway because ExtendedStackTraceElement was reused instead of just the extra class info.
- Rename StackTracePackageElementMixIn to ExtendedStackTraceElementMixIn.
- I wonder if this fixes [LOG4J2-651] Log4j 2 throws ArrayIndexOutOfBoundsException. Perhaps this was already fixed.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1597261 13f79535-47bb-0310-9956-ffa450edef68
Add missing '.' in message.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1597262 13f79535-47bb-0310-9956-ffa450edef68
<action issue="LOG4J2-647" dev="ggregory" type="update">
  Upgrade to Flume 1.5.0.
</action>


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1597263 13f79535-47bb-0310-9956-ffa450edef68