Merge pull request PowerShell#345 from PowerShell/development

Merge ChangeLog

Merge pull request PowerShell#304 from PowerShell/BugFixes

Bug fixes to Master

Merge pull request PowerShell#252 from PowerShell/BugFixes

Merge BugFixes to Master

Merge pull request PowerShell#144 from PowerShell/gitignore

Add .gitignore file