Allow explict setting of vpc_security_groups to allow modification of security groups of RDS instances within a VPC
Merge branch 'fix_rds_modify_security_group' of https://github.com/mohangk/ansible into mohangk-fix_rds_modify_security_group
Merge branch 'mohangk-fix_rds_modify_security_group' into devel
Fixing usage string in ansible-galaxy install for role files
Document "|default" Jinja2 filter example.
Some minor docs corrections.
Document ansible_managed changing the template.
Add sudo note.
add note about pipelining
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