Fix rules.touch tests

Move them to `rules` sub-directory and import `shells` instead of `and_`
which in turn triggers the `generic_shell` fixture fixing the tests on
Fish Shell.

thefuck/rules/touch.py

@@ -1,6 +1,6 @@
 import re
+from thefuck import shells
 from thefuck.utils import for_app
-from thefuck.shells import and_
 
 
 @for_app('touch')
@@ -10,4 +10,4 @@ def match(command):
 
 def get_new_command(command):
     path = re.findall(r"touch: cannot touch '(.+)/.+':", command.stderr)[0]
-    return and_(u'mkdir -p {}'.format(path), command.script)
+    return shells.and_(u'mkdir -p {}'.format(path), command.script)