Minor grammar fix in manpages
Fix documentation url
Allow hacking/env-setup module path to use config file library path

hacking/env-setup now adds the configured library path in ANSIBLE_CONFIG
to the ANSIBLE_LIBRARY environment variable in addition to the previous
default of ANSIBLE_HOME/library.

This replaces #5950.
Merge pull request #5967 from willthames/env_setup_library

Allow hacking/env-setup module path to use config file library path
mention that include works with addtional task files

Mention we can include roles/x/tasks/anothertasks.yml with `include anothertasks.yml` within the role's `main.yml` as this is not obvious from the documentation
Merge pull request #5972 from mmoya/docfix

Minor grammar fix in manpages and update docs url.
Merge pull request #5974 from jakubholynet/patch-1

mention that include works with addtional task files
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