refactoring tests to use platform specific pipe commands for linux, darwin and windows
extended the inputs_test for ProcessInput for debugging
added CR to the last token Pipe test for Windows
repointed the lpeg tarball to use people.mozilla.com as the original site seems to be down or gone
renamed platform specific test files to match build constraint guidelines :  http://golang.org/pkg/go/build
Merge pull request #507 from crankycoder/features/fix-process-chain

Refactored ProcessInput and ProcessChain tests to fix cross-platform issues