[BUGFIX] Fixed Bug #65, optional meta-headers working
Merge pull request #66 from miniat-amos/bugfix/65

[BUGFIX] Fixed Bug #65, optional meta-headers working
Added $folder parameter functions

Make page model more flexible adding $folder = CONTENT_DIR so it’s
possible to select where start the page tree, useful for creating
plugins.
Update Readme

Added

* Link to docs/wiki
* note about pico plugins
* update "reasons to use"
Merge pull request #71 from okadesign/master

Added $folder parameter functions to pages
add {{ content_dir }} and {{ content_url }} to twig_vars

This allows you to use {{ content_dir }} or {{ content_url }} in your theme templates.

I use it for adding images (sliders, header images, logos) or other file-specific content that I still want to be accessible by the client. It is a lot easier for them if their site "lives" in the content folder.

My usage: 

```html
{% for slide in config.slides %}
  <div>
    <img src="{{ content_url }}/images/{{ slide }}">
  </div>
{% endfor %}
```

Output

```html
<div>
  <img src="http://ohdoylerules.com/images/slide-1.jpg">
</div>
<div>
  <img src="http://ohdoylerules.com/images/slide-2.jpg">
</div>
```

This makes for a universal image. Which can be used regardless of the theme I have enabled.
add content_url and content_dir variables
[FEATURE] change code of meta parser to use a service

* added ServiceLocater service for meta parser
* remove old parser code and receive parser from ServiceLocator
* added new default plugin phileParserMeta with old parser code

Resolves: #76
Releases: 0.9.3
Related: #42
[TASK] added git commit message template
[BUGFIX] change requirement of plugin-installer-plugin to "dev-master", because we have currently no final version
Merge branch 'refs/heads/feature/MetaParserService' into feature/RefactoringInterfaces
[TASK] code cleanup: restructure interfaces
[TASK] added Changelog.md to the project
reformat the readme file

- add tables instead of lists
- fix broken links
- add the authors of PhileCMS
Merge pull request #77 from PhileCMS/feature/MetaParserService

[FEATURE] change code of meta parser to use a service
Merge branch 'feature/RefactoringInterfaces'
Merge branch 'master' of https://github.com/PhileCMS/Phile into upstream
merge from phile/upstream