Fix PHP notice: PHP Strict standards: Only variables should be assigned by reference

Fix PHP Notice:

PHP Strict standards: Only variables should be assigned by reference in add_caps_to_role() on line 564
Merge pull request #215 from azizur/master

Fix PHP notice: PHP Strict standards: Only variables should be assigned ...
PHP 5.2 compatibility (ternary operator)
Get if the ability to edit who authored the post. Not related to editorial metadata (but could be added in later if useful).
Merge branch 'fix-php52' of https://github.com/ziz/Edit-Flow into ziz-fix-php52
Update editflow versioning.
Update readme for v0.8. May need another refresh before it's pushed to .org.
Merge remote-tracking branch 'upstream/master'