Start refactoring of fs.js
Split up fs.js
Dump fs.js
Remove duplicate decls across filesystem/*
Fix failing tests for src/filesystem/* issues, all tests pass now
Move shell.js and environment.js to shell/
Remove dead code
Merge pull request #161 from humphd/issue143

Fix Issue #143
RSync as a Shell method. Missing README and tests
README started. Tests added
RSync tests done. Flags started

Functional flags:
size
recursive
checksum