Merge pull request #36 from Srirangan/master

`filter` parameter `fs.copy` and `fs.copySync`
update readme to reflect `filter` for copy() and `options` for {read,write}Json.
v0.8.0
Return err in copy() fstat cb, because stat could be undefined or null
Added regression test for copy() return callback on error
Merge pull request #39 from ulikoehler/newtest

Added regression test for copy() return callback on error
Merge pull request #38 from ulikoehler/patch-1

Return err in copy() fstat cb, because stat could be undefined or null
added Uli Köhler as a contributor
v0.8.1
update readme
There does seem to be a synchronous version now
Merge pull request #41 from jimhigson/master

There does seem to be a synchronous version now
added Jim Higson to contributors
added test for copy() when source dir() does not exist.
Update README.md
Merge pull request #45 from mikermcneil/patch-2

Added note about fse.outputFile() being the one that overwrites
update copyright year
Merge pull request #46 from gdi2290/patch-1

update copyright year
Update README.md
update rimraf to v2.2.6