InitializeDefaultRepeatedFields() allocates memory but does not release it.
Update version number to 2.6.1rc1
DestroyDefaultRepeatedFields is registered using OnShutdown.
Merge pull request #43 from abuszta/bugfix

Release objects allocated by InitializeDefaultRepeatedFields()
Merge remote-tracking branch 'origin/master' into 2.6.1
Update CHANGES.txt for 2.6.1rc1.
Update version number in generated files.
Update CHANGES.txt to include a bug fix.
Don't test for sched_yield on Windows
Add .gitignore file

Includes files generated by each of:
   * autogen.sh
   * configure
   * make
Update version number to 2.6.1.
Merge changes from 2.6.1 release branch.
Update version number to 2.6.2-pre.
Add the missing solaris atomics header file.
Merge remote-tracking branch 'upstream/master'