* using inspect module instead of iteritems(self.__class__.__dict__, due
  to the fact that the later does not include attributes from parent
  classes
* added tags/when attributes to Base() class for use by all subclasses
* removed value/callable code from Attribute, as they are not used
* started moving some limited code from utils to new places in v2 tree
  (vault, yaml-parsing related defs)
* re-added ability of Block.load() to create implicit blocks from tasks
* started overhaul of Role class and role-related code

Detect docker as virtualization_type

Detect kvm guests through sys_vendor.

Typo: greatful -> grateful

Add integration test for the shell module

Add --pretty option for gce inventory plugin

New docker versions use "docker" in /proc/1/cgroup, which disturbs the
virtualization_type detection. So, grep for docker, in addition of
"lxc".

The two detection methods currently implemented do not cover all cases.

For example qemu guests invoked like this:
qemu -machine pc-i440fx-1.4,accel=kvm -cpu SandyBridge

return this information:
product_name: Standard PC (i440FX + PIIX, 1996)
cpuinfo: model name      : Intel Xeon E312xx (Sandy Bridge)

Add note on block properties

inventory for implementation

* it ensures that it's possible to define options in the multiline block

python2.4 compatibility issue with urlparse

Fix detecting distribution release on OpenSuSE

Inventory Plugin to get hostgroups from FreeIPA

Use https for git submodules

Remove no-op string declaration

Typo: recieve -> receive.

Ansible raised exception during parsering /etc/SuSE-release file.
Regular expresion should use string instead of list.
Fix tested on OpenSuse 13.1