Removed code that duplicated nvpair_export().
Check envlist is not null before exporting!
Merge pull request #645 from dthain/master

Fix Crash if Environment Null
Add caching section to Parrot manual.

Fixes #327.
Merge remote-tracking branch 'ccl/pull/646/head'

* ccl/pull/646/head:
  Add caching section to Parrot manual.