Issue #140 - Fix for using pathogen or bundle from a Windows SMB file

[ecsousa]

I don't known if this is the best solution, but it worked for me.

If have just substitute a leading single slash after pathogen have splited runtimepath. It does all its work after that, but leaves shared paths with a leading triple slash.

So, after joined it all back, I replace the triple slash by just a double slash.