Add Gentoo install notes do intro_installation

don't double the count of i for LinuxHardware cpuinfo keys on 'vendor_id' and 'model name' keys

Conflicts:
	hacking/env-setup

Conflicts:
	hacking/env-setup

Corrected spelling mistake in ec2 inventory script

When checking for Xen for LinuxHardware processor facts, don't check sysfs if already found in /proc/

Set ansible_distribution_version differently for Solaris variants.

run_once tasks are skipped without checking the delegate_to host #9784

Add integration test for ansible-modules-core #460

Fix various inventory scripts to use env python

Fix https://github.com/ansible/ansible/issues/9948

'vendor_id' and 'model name' keys

Check for Xen paravirt and handle processor facts accordingly

fixed bad exampel for library that was library_path

not work

Enable environment keyword at play level

Fix some typos in developing_modules.rst

Improve wording in playbooks_intro.rst