path_dwim: fix when basedir not set
Updated authorized_key module documentation regarding manage_dir

Added a warning in the documentation about manage_dir when selecting an alternate directory for authorized_keys
Merge pull request #5823 from kustodian/authorized_keys

Updated authorized_key module documentation regarding manage_dir
Update RELEASES.txt
Update 1.5 changelog with list of new modules
Append new features to 1.5 changelog
Add reference to Guru to sidebar.
re-add the events widget
Handle implicit localhost when using '-i host,' syntax

Fixes #5820
Merge pull request #5527 from sergevanginderachter/basedirdwim

path_dwim: fix when basedir not set
Micro-optimization of inventory.expand_hosts.detect_range
Micro-optimization: replace s.find(x)!=-1 with x in s

timeit shows a speedup of ~3x on Python 2.7.5 x86_64.
It also makes the code a bit shorter.
hostname module: don't filter hostnamectl with awk

There's no need to filter hostnamectl's output with awk because its man
page says:

    hostnamectl [OPTIONS...] {COMMAND}

       --static, --transient, --pretty
	   If status is used (or no explicit command is given) and one
	   of those fields is given, hostnamectl will print out just
           this selected hostname.

E.g. hostnamectl --static status => ansible.example.org