Add getOrAdd to Map
Merge pull request #688 from ceedubs/map-getOrAdd

Add getOrAdd to Map
Delete useless `some` and `none` from OptionT
Add some useful `none` and `some` methods to OptionT
Relax `some` and `none` constraint

Should only require Applicative, not Monad.
Merge pull request #692 from puffnfresh/optiont-some-none

OptionT some/none
update sbt 0.13.2 and sbt plugins
Merge pull request #694 from cosmo0920/update-sbt-0_13_2

update sbt 0.13.2 and sbt plugins versions
update sbt-unidoc 0.3.0
Add examples link in README
Merge pull request #696 from ceedubs/patch-1

Add examples link in README
Remove parsing on Scala version.

I added this when I was bridging 2.11.0-M4/-M5, the time
that we modularised scala-xml and scala-parser-combinators.

Now, we just assume that "2.11.*" is modularized.

Nice side effect: the build is not tolerant of the custom,
SHA-based scala versions used in integration builds with
dbuild [1].

This change should be merged to scala-seven

[1] http://typesafehub.github.io/distributed-build/0.7.0/index.html
Scala 2.11.0 final