Fix for hashes in filenames, better uri encoding

[TBSliver]

Somehow having a hash in the filename, or something like that, caused the uri to 404 error. This fixes it, and actually encodes the outgoing uri properly. wooo!

[vanstyn]

From IRC:

<vanstyn> TBSliver: unfortunately, as I feared, there are issues with your 
          Rapi::Fs PR, so I can't merge as-is...
<vanstyn> I'll update the PR itself with details when I have a free
          moment...
<TBSliver> yea no worries
<vanstyn> TBSliver: hey...
<vanstyn> so, since you're here, the main issue is that I wasn't to avoid 
          uri encoding across the board
<vanstyn> because its 1. ugly and 2. can cause issues with current tab 
          detection, since both forms still work
<vanstyn> I *think* that '#' is a special case...
<vanstyn> might also be '?' and '&'
<vanstyn> but, in general, we'd like to keep the url path matching the 
          file path as much as possible
<vanstyn> since, as you already saw, modern browsers already handle uri 
          encoding automatically for the most part
<vanstyn> but, I will do some testing and see what I can find out 
      (unfortunately i'm spread pretty thin atm)

[TBSliver]

Have changed it to only percent encode specific characters ( these ones to be exact: &%#? ). more can be added quite quickly and easily in the same place as 99fbfd3