Update composer dependencies.

Removes some declarations like time and version since Git tags can be
used.
Added development dependenceies (behat, phpunit) and zend/dom and also
removes Zend/Dom from library folder (favoring composer dependency).
Move phpunit.xml to root folder.

Although not a best practive to lend a `phpunit.xml` file, this is a
library and I don't see people benefiting a lot from changing the
current configuration to other that may please them.

If this becomes an issue, we can always start ignoring `phpunit.xml` on
the VCS and distribute a `phpunit.xml-dist` so people can use it as a
base configuration file.
Template\Environment to factory templates.

A class to factory templating instances based on files or strings.
Also keeps configuration of templating output and operation.
WIP: New README, with a story.

Tell a story instead of being the central focus of documentation. The
primary (and only) objective of this README should be:

- Give direction and information to new comers.

Being as direct as possible, having links whenever is possible whilist
providing the objectives and visions of the project (the boudaries of
the project).