ast : README ref links

Abstract Syntax Tree
ast : gitignore
sat : README update
sat : package.json
ast : source code to process
sat : source code samples
ast : gitignore - add one more rule
fs - walkdir
ast - first esprima test
fs examples with promises
Merge branch 'ast' into require-build
fs - tests
sat - add node npm dependencies
ast : /src/require.config.js code review
fs - check if file/dir exists
fs : README add link to fs-extra
ast : navigate through abstract syntax tree
ast - add fs-extra to output files
ast - generate abstract syntax tree files from javascript sources files
Merge branch 'master' into require-build