Added cd_mkdir rule

This fixes #50 and #98.

```bash
$ cd foo/bar/baz
cd: foo: No such file or directory
$ fuck
mkdir -p foo/bar/baz && cd foo/bar/baz
```

Added matchers for both Bash and sh error messages. Depending on your
default shell, the messages might be slightly different.

thefuck/rules/cd_mkdir.py

@@ -0,0 +1,14 @@
+import re
+from thefuck.utils import sudo_support
+
+
+@sudo_support
+def match(command, settings):
+    return (command.script.startswith('cd ')
+        and ('no such file or directory' in command.stderr.lower()
+            or 'cd: can\'t cd to' in command.stderr.lower()))
+
+
+@sudo_support
+def get_new_command(command, settings):
+    return re.sub(r'^cd (.*)', 'mkdir -p \\1 && cd \\1', command.script)