[BUGFIX] Allow for filter value 0

Fixes #480
[TASK] Tiny Typo in IteratorFilterTest
Merge pull request #486 from cedricziel/iteratoreFilterinhoFixos

[BUGFIX] Allow for filter value 0
[DOC] Change incorrect include/exclude use
[FEATURE] Cookie-less domain prefix setting

This commit adds a `plugin.tx_vhs.settings.prependPath` setting which when used is inserted in front of all (relative) asset paths - including those returned by VHS's image ViewHelper and relative resource path ViewHelpers. In addition, the ViewHelper `v:page.prefixPath` ViewHelper is added which outputs this setting's value so it can be used with other ViewHelpers like `f:uri.image` or `f:uri.resource`.

This setting has precedence over VHS's respect for `config.absRefPrefix` which means it is capable of containing a secondary domain name and protocol, allowing all URIs built for assets to _use a cookie-less domain name for all asset paths_. Doing this is generally considered a good idea since it allows requests to that domain to set and receive no cookies and thus be smaller and faster to process.
Merge pull request #491 from NamelessCoder/cookielessmonster

[FEATURE] Cookie-less domain prefix setting
[TASK] Exclude sysfolders from being considered subpages
Merge pull request #496 from bjo3rnf/sysfolderexclude

[TASK] Exclude sysfolders from being considered subpages
Merge pull request #499 from FluidTYPO3/development

[TASK] Merge staging...development to create 1.8.5
[TASK] Change state and author

This changes the state of the extension to "beta" while on the development branch. Also changed is author, updated to recent standard.
[TASK] Disable coverage collection in Travis script
[TASK] Adjust test case instance construction
[TASK] Remove temporary Git install from Travis script
[TASK] Temporarily switch back to old class names in test
[BUGFIX] Cast to boolean before type-strict comparison

Fixes: #502
[BUGFIX] Make default menu behavior use shortcut UID

This changes two things:

1. The default value of `useShortcutUid` is set to TRUE since this will be the desired rendering in almost all cases.
2. The shortcut itself is added to the root line if the current page UID is the target of the shortcut and the shortcut is to "parent of current page".

The result of this is that all shortcuts' active and sub states become properly set when shortcut-to-parent is in used.
[TASK] Set version in composer.json
Merge pull request #503 from NamelessCoder/useshortcutuid

[BUGFIX] Make default menu behavior use shortcut UID
[TASK] Composer.json whitespace fix
Merge pull request #504 from FluidTYPO3/development

[TASK] Prepare 1.8.5