Added ability to add/customize globals with: addGlobal(name, func)
Express: add view engine support (view without extension).
Merge pull request #241 from gillesfabio/view-without-ext

Express: add view engine support (view without extension).
don't optimize variable lookups in  (fixes #166)
resolve `set` to the outer-most scope that has the variable defined (if exists)
update browserfiles and commit `set` tests
Merge pull request #239 from garygreen/feature/customize-globals

Added ability to add/customize globals with: addGlobal(name, func)