gulp: do not include timestamp in the transpiled source

Fixes #5
Use traceur from github

Instead of relying on local hacks (exports).
Support typed variables

Closes #1
Handle string -> String type
Initial commit
fix(traceur): use patched traceur with correct exports
fix(gulp): simplify and add options to reload the compiler sources
feat(gulp-traceur): add simple gulp-traceur plugin that allows to reload the compiler sources
chore(cleanup): update .gitignore and remove stale file