Fix minor bugs for Ansible Galaxy and documentation update

v2.0.0-rc2

Change categories to new galaxy_tags

Ansible 2.0 compatibility

Release notes:

• - The option dumpall_flat_mode has been removed
• * The role is Ansible 2.0 compatible
• + Two new options dumpall_keep_on_guest: no and dumpall_keep_on_host: yes
• + Assertions has been added to the code.

Compatibility is broken from v1.

Ansible 2.0 support and code cleaning

This release make support to Ansible 2.0, and bring some code clean.

Fix little bugs and make this roles more convenient to use

v1.0.1

Update ansible-galaxy metadata