Refactored VM to two separate VMs; std & debug

Standard VM should be about 10x faster than the debug VM. Some error
checking has been removed, all of the log statements and therefor quite
some unnecessary if-statements.
Changed VM Test code
Tests for native function calling
Removed old installer script
ethlog: improve dispatch concurrency

This also fixes a deadlock in the tests.
ethlog: fix test compilation error
ethlog: Reset before each test
ethlog: add test that adds log systems concurrently
ethlog: fix StdLogSystem data race on level
ethlog: improve TestLogSystem

It's now safe for concurrent access.
Output checking looks better.
ethlog: don't buffer output in TestConcurrentAddSystem
ethlog: verify that Flush is blocking in TestLoggerFlush
ethlog: add GoDoc documentation