Export-NUnitReport function was missing a close tag

Failed test cases weren't closing their failure tag, which resulted in the whole file structure being thrown off.  (test-case elements were being nested inside other test-case elements, etc.)
Merge pull request #195 from dlwyatt/NUnitFix

Export-NUnitReport function was missing a close tag
Update CHANGELOG.md
Upping the version to 3.0.1
Updated version in psd1 file
Fixing wrong version in the manifest, publishing new version so I can update it on Nuget/Chocolatey
Adding Gherkin Support to Pester
Add support for background and Scenario Outline
Create my own (mini fork) of pickle for simpler parsing
Refactor Features and Steps to their own functions for reuse
Refactor WHEN to just store steps in a hashtable
Fix tag filtering (it's still not feature-compatible with Cucumber's)
Allow multiple matches and pick the best match
Fix Background (should (re)run before every test)
Add the keyword to the step printed output
Blindly updating wrapper code from changes to Pester Beta ;-)
Some more output tweaks for Gherkin results
Add support for tables in steps
Fix code coverage for Gherkin
Fix bug in Path parameter (we still need to load ALL steps files)
Fix bug in step matching: the pattern should match the WHOLE name from ^ to $
An attempt to unify with Pester a little more...
Change the "Steps" back to scripts instead of modules.
Improve output:
+ only print features where at least one scenario was tested
+ add scenario counts for the report
+ add information about step file count
Patch DocStringArgument