Update raygun4node readme

Described sending request data without using express.
Spelling fix
used conventional parameter name
add travis build config
remove old versions and bump requirements
remove grunt and use tap for testing

this is easier for travis to deal with
update the readme
remove this test for now
Merge pull request #15 from MindscapeHQ/travis-ci-build

add travis build config
add ability to filter keys from the http data
update the readme
pass the filters correctly :tada:
Merge pull request #14 from MindscapeHQ/filter-keys

Filter sensitive keys
Add new affected user tracking data to raygun.user(req)