Very minor formatting changes

[codykonior]

Changes proposed in this pull request:

• Some files had BOM headers, these were removed so they're raw UTF8
• Replaced the few instances of tabs with spaces
• In the Pester tests if $PSVersion isn't defined then we define it so users can run Invoke-Pester

Has been tested on (remove any that don't apply):

• Powershell 5.1
• Windows 10

[MVKozlov]

Stripped BOM headers not supported in PSv2, It fail to detect utf8

[codykonior]

If this were true then the module would not function in the first place, because not every file used a BOM header. Only some files had BOM header and this standardises them.

Second of all the module still executes when run under powershell -version 2.

[MVKozlov]

May be this is becase it really does not contain any non-ascii symbols, so it non-utf ? :)

But contain BOM on accident, so the topic should sound like 'convert unneeded utf to ascii' ?