Remove stylesheet.
Remove Python style 'import' as it is not used in Powershell.
Replace Python 'raise' with Powershell 'throw' keyword.
Remove Python 'pass' from Powershell keywords.
Remove 'yield' keyword as it is not used in Powershell.
Remove 'default' keyword as it is not used in Powershell.
Remove 'with' keyword as it is not used in Powershell.
Add 'do' and 'until' keywords to grammar.
Remove '(global)' which is not used in Powershell.
Add tests for 'if-elseif-else' keywords.
Add tests for do-until statements.
Add hyphen to logical operators supported by Powershell.
Remove logical operators not supported by Powershell.
Add 'xor' logical operator.
Merge remote-tracking branch 'jagrem/master'