Revert "Setting version to 2.0.0-SNAPSHOT"

This reverts commit 3367f07d5b6a945c1ce1c1db0aaf88ea2a555cd1.
hlistSelectLens, an HList element lens derived from element type.
Doc for hlistSelectLens.
recordLens, a lens over a named field of an extensible record.
A bit of style.
Merge pull request #52 from S11001001/topic/hlist-select-lenses

HList select lenses
Added support for lazy recursive implicit values.
Added factory methods to Nat ops type class companions.
Added factory methods to Coproduct ops type class companions.
Added factory methods to function ops type class companions.
Added factory methods to HList ops type class companions.
Added factory methods to product type class companions.
Added factory methods to record type class companions.
Added factory methods to Traversable ops type class companions.
Added factory methods to tuple ops type class companions.
Merge branch 'master' into scala-2.11.x
Revert "Revert "Setting version to 2.0.0-SNAPSHOT""

This reverts commit 6ee91eb2d97e6448d7690bd29be6ed1831dea3d2.