Many fixes and improvements to all existing refactorings.

• Fix paths of fix-class-names generated patches not generated from working directory, preventing a direct pipe to |patch -p1 (GH-30)

• Fixed support for fix-class-names command. This includes
  various fixes that are aggreated under the GH-28, GH-29, GH-19
  and GH-20. The command is now much more robust and does
  not create false/positives anymore.
• Added optimize-use <file> command that will convert all
  relative or absolute usages of namespaces into use statements,
  leaving only the last part at the occuring position.
  (by @pscheit)