Only normalise known headers in http node
Handle blank config file
Rework nr-cli

- better componentisation
- add 'search' option to look for npm modules
- add 'target' option to point at non-default installs
Add cli tests
Use request.del in cli request module
Fix race condition on saving config
Missing brackets in sample node
Closes #414
Don't cache api requests in the editor
Fixes #413
Bump 0.9.0
Ensure valid mongo selector object
Force file node to write "binary"  - so as not to expand binary like chars
into utf encoding. Helps with writing strings that happen to be binary
encoded rather than buffers.
Added split node to split message into array or series of messages