Merge pull request #15 from dirkbaechle/master

SCons examples
#1, add a digest example, along with a Shake example
#1, add a SCons example of digest
Update README.md
Whitespace only
Add support for TupLua, from Simon Gardener
Add support for spaces in the tuplua syntax, from Simon Gardener
Merge branch 'master' of https://github.com/ndmitchell/build-shootout

Conflicts:
	Util.hs
Remove trailing whitespace, from Simon Gardener
Add a nofileout example, from Simon Gardener
Switch to building times2 off dir2, from Simon Gardener
Fix the tup nofileout example
Rename 'system' to 'system1'
Add 'system2' example
Add extension to TupLua examples
Add 'noleftover' example
Minor tweak to the Shake system2 example
Rewrite so it doesn't directly manipulate the environment variables of the current process, just the ones it spawns
- added SCons example for "system2" test