OAuth Requests and Documentation Updates

[markekraus]

• Revamped Class Handling System
• Added OAuth Access Token Import, Export, and Request functionality
• BuildDocs build task now runs as a job
• BuildDocs now updates the Module Page
• BuildDocs now documents new Enums and Classes
• BuildDocs now populates Examples
• Pester tests now only show fails
• Help.Tests.ps1 now detects template artifacts
• Help.Tests.ps1 now tests documentation for Classes, Enums, and Private Functions.
• psake.ps1 output improvements
• Build.ps1 change to have better local build support
• Function load method changed to .psm1 dot sourcing
• File header changes
• Code formatting changes
• Added RedditOAuthToken Class
• Added RedditOAuthGrantType Enum
• Added Export-RedditOAuthToken
• Added Import-RedditOAuthToken
• Added Request-RedditOAuthToken
• Added Private Function Get-AuthorizationHeader
• Added Private Function Request-RedditOAuthTokenClient
• Added Private Function Request-RedditOAuthTokenCode
• Added Private Function Request-RedditOAuthTokenImplicit
• Added Private Function Request-RedditOAuthTokenInstalled
• Added Private Function Request-RedditOAuthTokenPassword
• Moved Show-RedditOAuthWindow to Private function
• Moved Request-RedditOAuthCode to Private function
• Tests added for all classes and functions

Works towards #5 #6 #7 #8 #9 #11 #12