Add convenience methods

[saturnism]

For #115

---

This change is 

[aalmiray]

---

Reviewed 3 of 3 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

---

subprojects/jdeferred-core/src/main/java/org/jdeferred/DeferredManager.java, line 603 at r1 (raw file):

	 * A convenience method create a {@link Promise} that immediately resolves to a value.
	 *
	 * @since 2.0

we should add @since 2.0 to all new variations of when(), also race and settle. New interfaces such as CallbackExceptionHandler, CancellationHandler` and their setters should be marked too

---

Comments from Reviewable

[coveralls]

Coverage increased (+0.08%) to 54.812% when pulling 1ad6c1f on saturnism:88-convenience into 395e988 on jdeferred:2.x.

[saturnism]

Review status: all files reviewed at latest revision, 1 unresolved discussion.

---

subprojects/jdeferred-core/src/main/java/org/jdeferred/DeferredManager.java, line 603 at r1 (raw file):

Previously, aalmiray (Andres Almiray) wrote…

we should add @since 2.0 to all new variations of when(), also race and settle. New interfaces such as CallbackExceptionHandler, CancellationHandler` and their setters should be marked too

Agreed! I noticed we didn't have that :( Added #137

---

Comments from Reviewable