Add functionality to run pester and Automatically generate code coverage visualization

[TravisEz13]

• Create a common way for which repo can call pester (Add Shared Code for AppVeyor, Markdown & Example testing and Automatic Documentation Generation #90)
• fix style issues such as putting code blocks starts on new line (where possible). (Fix formatting #116)
• Add a common way to automatically detect code and non-code files for code coverage (Add Shared Code for AppVeyor, Markdown & Example testing and Automatic Documentation Generation #90)
• Add a way to override code and non-code coverage file detection filed In AppVeyor.psm1 there should be an option to change how we detect the files that need code coverage #114
• Add a common way to convert Pester test results object into the code coverage visualizer format (I'm planning on using codecov.io, similarly to PowerShell\PowerShell) (Add support for codecov.io code coverage reporting. #117)
• Add a common function to upload results to the code coverage visualizer (Add support for codecov.io code coverage reporting. #117)
• Add deployment documentation(Add support for codecov.io code coverage reporting. #117)