Essential for working on Macs

Gets rid of .DS_Store files
enforce consistency of succn/predn
fix succorder/predorder
check the law for Enums without min/max elements
intercalate generalized to Foldables of Monoids.
Length and Each instance of Diev
Remove specialized intercalate functions; should use Foldable[X].intercalate as a function instead.
xml tests
Merge pull request #231 from xuwei-k/xml-test

xml tests
add arbList method for fix xml test in Scala2.10.0-RC5. see #231
Merge pull request #232 from xuwei-k/fix-xml-tests

add arbList method for fix xml test in Scala2.10.0-RC5
Merge pull request #229 from S11001001/topic/monoid-intercalate

intercalate generalized to Foldables of Monoids
Lens families
Merge pull request #203 into scalaz-seven
Merge pull request #210 from larsrh/topic/enum-laws

Enum laws
Merge pull request #230 from xuwei-k/diev-instance

Length and Each instance of Diev
bump to 2.10.0 final
Releasing 7.0.0-M7
Bump to 7.0-SNAPSHOT
fix scaladoc