PowerShell ISE Theme

Created PowerShell ISE Theme

Changed ps.txt language so that OPTION:VARIABLE to CONSTANT switched
values to correct colors assigned to command switches so they no longer
matched variables.

Cleaned up tab spaces in ps.txt.
PowerShell ISE Theme - Additional Fixes

Fixed number and math symbol colors.
Merge pull request #181 from ITFiend/master

PowerShell ISE Theme