Changes to be committed:
	modified:   src/GitPrompt.ps1
		remove the old code
	modified:   src/PoshGitTypes.ps1
		add config entry to disable tab labelling
	modified:   src/WindowTitle.ps1
		added functions to label tabs
	modified:   src/posh-git.psm1
		added call to tab labelling code

	modified:   src/PoshGitTypes.ps1
		Made the TabTitle setting more like WindowTitle so it can be customised by users
	modified:   src/WindowTitle.ps1
		Removed tab handling code from here
	new file:   src/TabTitle.ps1
		moved all Tab related functionality here
		added code to reset tab names when leaving a repo space
		also will reset when unloading the posh-git module
		implemented simpler unique tab naming algorithm as suggested
	modified:   src/posh-git.psm1
		Added references to the new TabTitle script file and it's functions