Bump version to 0.5.2.1
Implement cloneArray and cloneMutableArray for GHC >= 7.2.1
Add fallback function for cloneArray and cloneMutableArray for GHC < 7.2.1
Oops, the CPP constant for GLASGOW_HASKELL in 7.2 should be 702, per https://ghc.haskell.org/trac/ghc/ticket/6023
Merge pull request #7 from jberryman/master

Implement cloneArray and cloneMutableArray for GHC >= 7.2.1

(note: I had to rebase the merge on top of v0.5.2.1)
Convert changelog to markdown and update entries
Update .travis.yml to include GHC 7.8.2
Re-add 7.2.2 to Travis build-matrix
Bump version number to 0.5.3.0

Functions for cloning arrays were added.