[BUGFIX] Remove PHP warning if variables argument is NULL

In some case argument $variables is NULL and raises a PHP warning:
Warning: Invalid argument supplied for foreach()
Merge pull request #6 from fudriot/bugfix-warning-if-attributes-is-null

[BUGFIX] Remove PHP warning if variables argument is NULL
[TASK] Switch to raw header output
[TASK] Support CSV class names natively in Tag ViewHelper
[BUGFIX] Replaced legacy flux:flexform names
Merge pull request #8 from hmspl/flexform_to_form

[BUGFIX] Replaced legacy flux:flexform names
[BUGFIX] CSC must be disabled
Merge pull request #9 from hmspl/css_disable_readme

[BUGFIX] CSC must be disabled
[TASK] Change state and version

Sets the state to "beta" on the development branch and changes the version number to the expected release version number in order to once again allow EM to properly install.

Also changed: author.
[BUGFIX] Add default header type setting

Adding this setting not only allows setting the default header type but also prevents any header tags from becoming "H0" (h-zero). Technically not a feature, although useful as one.
[TASK] Fill in Header element type
[TASK] Limit choices in Header element TCA
[TASK] Clean up header size value selection using v:or
[TASK] Simplify header/headers palette modifications
[BUGFIX] Decent default for header level
Merge pull request #10 from hmspl/default

[BUGFIX] Decent default for header level
[DOC] Properly declared "included content types"
[TASK] Remove temporary Git install from Travis script
[FEATURE] Convention for plugin description LLL location

This feature enables using LLL to display a description beneath plugins displayed in the new content wizard. The name of the label must be `plugin.list_type.description`.
[TASK] Switch strategy for reporting missing plugin descriptions

Before: "LLL not found" message displayed as description.

After: Message placed into dev log with NOTICE severity.