Fixed bug that caused application to cast a "TypeError: Cannot call method
'addListener' of undefined" when first watching a file, unwatching and then
watching same file again.
Instead of installing the files in /usr/lib/node/libraries and loading them
from the file system, the files are built-in to the node executable.
However, they are only compiled on demand.
The reasoning is:
1. Allow for more complex internal javascript. In particular,
process.stdout and process.stdin can be js implemented streams.
2. Ease system installs. Loading from disk each time is unnecessary
overhead. Note that there is no "system" path for modules anymore. Only
$HOME/.node_libraries.
Allows for more fine graining, especially finding out about an individual
chunk of data being flushed in a write stream rather than the whole queue.
This commit also fixes a bug causing forceClose to fail on a readStream that
did not finish opening yet.