postgresql_db: add args lc_collate, lc_ctype

Allow the specification of additional locale settings (lc_collate and lc_ctype) when creating a new database (state=present).

Fail if the specified database already exists with different locale/encoding settings. (These settings can't be changed for existing databases as far as I know, and failing seems better than suggesting that no change was necessary by returning changed=False)
Extend authorized_keys module for use with alternate AuthorizedKeysFile configurations
adds private_ip param to ec2 module
Added functionality for md5 checksum together with a new overwrite param
to indicate that remote file should be overwritten if a file with the
same filename exists.
simple fix for issue 2564
when we encounter a group we've not seen before - we need
to make sure we make it a subgroup of 'all', no matter what
Improved Lookup plugins documentation
Merge pull request #2570 from skvidal/devel

simple fix for issue 2564
Merge pull request #2446 from b6d/postgresql_db-module-extension

postgresql_db: add args lc_collate, lc_ctype
Merge pull request #2575 from gw0/docs-lookup

Improved Lookup plugins documentation
Added an extra check for target nodes with selinux but without libselinux-python package installed
Make private key customizable per host using ansible_ssh_private_key_file configurable as variable

This fixes issue #1026 for @toshywoshy together with ansible_ssh_user and ansible_ssh_port.
Standardize args/kwargs on connection plugins.
Chroot also needs args/kwargs.
update changelog
Merge branch 'devel' of git://github.com/gregswift/ansible into devel
Fixup module docs.
Merge pull request #2578 from arrfab/selinux-fix-2

Added an extra check for target nodes with selinux but without libselinux-python package installed
This SELinux commit is too strict and we should only fail if trying to read/tweak SELinux attributes else
python-selinux can't be installed w/ the yum module when missing.

Revert "Added an extra check for target nodes with selinux but without libselinux-python package installed"

This reverts commit 550986b6a1a0af30294c16bb3155150de8851d7d.
Merge pull request #2550 from joelsemar/devel

adds private_ip param to ec2 module
Merge pull request #2554 from magnusart/s3-overwrite-param

New try: s3 overwrite and checksum support