Complete remaining Jasmine unit tests for `Deft.Promise` and `Deft.Chain`

[johnyanarella]

See TODOs in spec/Deft/promise/Promise.coffee.

[johnyanarella]

These unit tests have been implemented in the promises_aplus branch and will be part of the Deft JS 0.9 release.

NOTE: These unit tests were implemented using Mocha instead of Jasmine. The test runner and associated tests can be found in the /tests directory and its subdirectories. For Promise/A+ compliance testing, we are using the Promise/A+ Compliance Test Suite, which is Mocha-based.

[johnyanarella]

Deft.Chain

• Added support for optional arguments and initial values, where appropriate.
• Added improved error detection, handling and reporting.

New mocha-based test suite:

• Added mocha, chai, sinon, mocha-as-promised, chai-as-promised, and sinon-chai.
• Added setImmediate.
• Added and integrated a browser-friendly build of the official Promises/A+ test suite.

Eliminated the original Jasmine-based Deferred and Promise unit tests, as these have been invalidated by the new Promises/A+ implementation. Replaced with new mocha-based unit tests with massively improved coverage of the Deft.Promise and Deft.Chain APIs.

See also: #82