Fixed #3433. Using get_bin_path, removed uneeded imports, "module" is inlined, misc other style improvements.

  Migrated all examples: in DOCUMENTATION=''' string to standalone EXAMPLES=''' string
  Added deprecation warning to moduledev.rst and remove deprecated example from it
  Fixed up a few typos and uppercased some acronyms.
  add consistency to how EXAMPLES are formatted

In MySQL 5.6, the root account created by default during MySQL
installation has the PROXY ... WITH GRANT OPTION privilege for ''@'',
that is, for all users.

The mysql_user module tries to revoke this privilege, but this fails:
_mysql_exceptions.ProgrammingError: (1064, "You have an error in your
SQL syntax; check the manual that corresponds to your MySQL server
version for the right syntax to use near '''@'' FROM 'root'@'localhost''
at line 1")

Quick fix: don't revoke privilege if user is root and the privilege to
revoke contains PROXY.

for fetching riak stats.

Use psycopg2's mapping from PostgreSQL encoding names to Python codec names.