Add Nondeterminism[scala.concurrent.Future].
more code generation
add a headMaybe
add unfoldm method like unfold but using maybe instead of option
add a type alias for NonEmptyIList using OneAnd
Adds a double ended queue

Uses the "Bankers double ended queue" as described by C. Okasaki
fix some typos
switch trait to abstract class

thanks @xuwei-k
Make Dequeue constructors private

(thanks @wemrysi)
latest current stable version is 7.1.0
Predef.conforms is deprecated. use identity
remove unused import
Merge pull request #787 from xuwei-k/code-generation

more code generation
update links. scalaz-seven is no longer maintenanced

- https://groups.google.com/d/topic/scalaz/4gKSSYwpKxE/discussion
- https://github.com/scalaz/scalaz/commit/0a5f2e9b9c1db0e90ff873909033cb7fb313a989#diff-04c6e90faac2675aa89e2176d2eec7d8R122
 - https://github.com/scalaz/scalaz/blob/0a5f2e9b9c1db0e90ff873909033cb7fb313a989/core/src/main/scala/scalaz/OptionT.scala#L23
 - https://github.com/scalaz/scalaz/blob/0a5f2e9b9c1db0e90ff873909033cb7fb313a989/core/src/main/scala/scalaz/OptionT.scala#L59
tweak scaladoc
add MonadPlus instance for StateT

StateT has a simple MonadPlus instance if it is transforming a MonadPlus. Added
this implementation and a couple of basic tests.
Add Maybe.fromNullable for null -> Empty

I consider it a major oversight that I failed to address Java interop
where `null` is a possibility in my original implementation of Maybe. This
commit adds `Maybe.fromNullable` which works similarly to `Option.apply`. If it is
passed `null` it returns `Empty` but otherwise just wraps a value in
`Just`.

The name `fromNullable` was chosen to be explicit about the fact that it
accepts a null input. It was determined that `Maybe.apply` would be a
bad choice because it might be expected to be the same as Maybe's
`point` (which it is not).
Reduce Vector Monoid to be just O(n) for 2.10
Fix Monoid for IndexedSeq rather than Vector
Delete IndexedSeq instances and operations

Use Vector, where we can talk about complexity of all operations, rather
than just a couple.