feature: Bump base to include luvit and libuv upgrades
* 64-bit Windows version of Virgo
* fix: Add Signal Test
  * Verify singals are working by testing the log everything signal (SIGUSR2)
* fix: regression caused by merge in plugin test error codes
  * some error codes change to -1 in the new libuv (previously 127)
  * may be a libuv bug as windows and unix return different errors
Merge pull request #461 from racker/upgrade_libuv

feature: Bump base to include luvit and libuv upgrades
*amended to contain merged base hash