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.

Also, fix syntax definitions to include '/' as well wherever they use '\k' so
that / is still highlighted.

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

@@ -15,11 +15,11 @@ syntax match fishIdentifier /\$[[:alnum:]_]\+/
 syntax region fishString start=/'/ skip=/\v(\\{2})|(\\)'/ end=/'/
 syntax region fishString start=/"/ skip=/\v(\\{2})|(\\)"/ end=/"/ contains=fishIdentifier
 syntax match fishCharacter /\v\\[abefnrtv *?~%#(){}\[\]<>&;"']|\\[xX][0-9a-f]{1,2}|\\o[0-7]{1,2}|\\u[0-9a-f]{1,4}|\\U[0-9a-f]{1,8}|\\c[a-z]/
-syntax match fishStatement /\v;\s*\zs\k+>/
-syntax match fishCommandSub /\v\(\s*\zs\k+>/
+syntax match fishStatement /\v;\s*\zs(\k|[/])+>/
+syntax match fishCommandSub /\v\(\s*\zs(\k|[/])+>/
 
 syntax region fishLineContinuation matchgroup=fishStatement
-            \ start='\v^\s*\zs\k+>' skip='\\$' end='$'
+            \ start='\v^\s*\zs(\k|[/])+>' skip='\\$' end='$'
             \ contains=fishSpecial,fishIdentifier,fishString,fishCharacter,fishStatement,fishCommandSub,fishComment
 
 highlight default link fishKeyword Keyword