drush_instance 7.x-1.0-rc2

Second release candidate, fixes:

• #2118387: Extend documentation for alias files detailed HOWTO documentation
• #2133251: Drush 5.8 requires --strict=0 to build instance drush make seeing options that only drush instance should see; refactoring and adding a unit test; possible fix
• #2117685: Unit tests for (local) rsync unit tests for (local) rsync
• #2117691: Support file copy as a method of prepopulating files copying as a path source, for files and directories