adding release process document
adjust to comments
clarify cmf release versus bundles and component release
Added CONTRIBUTING.md
Merge pull request #168 from symfony-cmf/release-process

[RFC] adding release process document
Updated testing doc
update for cmf_request_aware change in https://github.com/symfony-cmf/CoreBundle/pull/56
Merge pull request #176 from symfony-cmf/request-aware

update for cmf_request_aware change
describe basic blocks a bit more in detail
Merge pull request #177 from symfony-cmf/block-type-doc

describe basic blocks a bit more in detail
Block: document prepended configuration
Merge pull request #175 from rmsint/block_prepend_extension

Block: document prepended configuration
Block: cache - add config to enable esi
Block: cache - add xml + php config
[#154] Fixed map items
Fixed typo
Merge pull request #170 from WouterJ/add_contributing

Propose CONTRIBUTING.md
Merge pull request #173 from dantleech/testing

Updated testing doc
Merge pull request #181 from rmsint/block_varnish_fragments

[WIP] Block: cache - add config to enable esi
Reverted commit 9795d68