Remove '/' from iskeyword so that 'w' doesn't skip over entire paths.

I didn't remove the iskeyword definition entirely because I believe including
'_' and '.' is still useful.

Use 'syntax iskeyword @,48-57,-,_,.,/' in the syntax definitions so that '/' is
still matched by syntax patterns that use '\k'.

cc: dag#44

ftplugin/fish.vim

@@ -13,7 +13,7 @@ setlocal foldexpr=fish#Fold()
 setlocal formatoptions+=ron1
 setlocal formatoptions-=t
 setlocal include=\\v^\\s*\\.>
-setlocal iskeyword=@,48-57,-,_,.,/
+setlocal iskeyword=@,48-57,-,_,.
 setlocal suffixesadd^=.fish
 
 " Use the 'j' format option when available.

syntax/fish.vim

@@ -3,6 +3,7 @@ if exists('b:current_syntax')
 endif
 
 syntax case match
+syntax iskeyword @,48-57,-,_,.,/
 
 syntax keyword fishKeyword begin function end
 syntax keyword fishConditional if else switch