remove ReaderWriterStateT form TODO.txt
alias `gtc` no longer exists

https://github.com/scalaz/scalaz/commit/b4585367a51d04
fix sbtosgi url
fix infinite loop bug of Traverse[EphemeralStream]

old implementaion of `traverseImpl` calls `Traverse#foldRight`
this cause following infinite loop

```
[error] scalaz.EphemeralStreamInstances$$anon$2.traverseImpl(EphemeralStream.scala:107)
[error] scalaz.Traverse$Traversal.run(Traverse.scala:36)
[error] scalaz.Traverse$class.traverseS(Traverse.scala:58)
[error] scalaz.EphemeralStreamInstances$$anon$2.traverseS(EphemeralStream.scala:107)
[error] scalaz.Traverse$class.runTraverseS(Traverse.scala:61)
[error] scalaz.EphemeralStreamInstances$$anon$2.runTraverseS(EphemeralStream.scala:107)
[error] scalaz.Traverse$class.foldLShape(Traverse.scala:100)
[error] scalaz.EphemeralStreamInstances$$anon$2.foldLShape(EphemeralStream.scala:107)
[error] scalaz.Traverse$class.foldMap(Traverse.scala:104)
[error] scalaz.EphemeralStreamInstances$$anon$2.foldMap(EphemeralStream.scala:107)
[error] scalaz.Traverse$class.foldRight(Traverse.scala:107)
[error] scalaz.EphemeralStreamInstances$$anon$2.foldRight(EphemeralStream.scala:107)
[error] scalaz.EphemeralStreamInstances$$anon$2.traverseImpl(EphemeralStream.scala:118)
[error] scalaz.EphemeralStreamInstances$$anon$2.traverseImpl(EphemeralStream.scala:107)
```
add Equal[EphemeralStream[A]]
EphemeralStreamTest
Merge pull request #398 from xuwei-k/fix-EphemeralStream-traverse

fix infinite loop bug of Traverse[EphemeralStream]
DualInstances extends DualInstances0
Merge pull request #399 from xuwei-k/request/dual-instance

DualInstances extends DualInstances0
relax constraint. s/ApplicativeSemigroup/ApplySemigroup
Merge pull request #400 from xuwei-k/request/apply-semigroup

relax constraint. s/ApplicativeSemigroup/ApplySemigroup
avoid allocate unnecessary new objects
remove unnecessary parameter
Merge pull request #403 from xuwei-k/ListT-unnecessary-param

remove unnecessary parameter
Merge pull request #402 from xuwei-k/request/no-allocate

avoid allocate unnecessary new objects