Patch supertest fix

Supertest 2.0.1 changed the way missing response bodies were reported, necessitating a change in the spec for send-seekable.

Update tests to Supertest 2.0.0

Supertest 2 removes type coercion in expects for fields, so the content-length checks in the test suite had to be changed to strings:

// before
expect('Content-Length', 33)
// after
expect('Content-Length', '33')

Dev chore release

Updates package ranges.

Installation instructions patch

Fixes the name of the NPM package in the README.

Initial Release

Revert "add table of contents"

This reverts commit bf6fdeb0e0acb7d05fce1673808bac8ce3f84ed4.