Fix #24 - Use io.popen instead of os.execute to check for git
Fix #24 - Use io.popen instead of os.execute to check for git

Had to replace os.execute as it produced garbled output on Windows.

Apparently this is an issue within LOVE / LuaJIT itself.
(see https://bitbucket.org/rude/love/issue/940)

rm-code/logivi