github: add travis hooks config
github: update travis configuration
github: add universe repository to travis
switch to vle 1.1.999

We keep the compatibility with the stable branch 1.1

- Cleanup the NEWS file
- Move AUTHORS, NEWS and README to markdown format
AUTHORS: update
Switch to 2014
gvle: update AUTHORS
gvle: update website
gvle: fix the matrix value editor

The matrix value conditional experiment port editor has been fixed.
vpz: set duration and begin into the conditions

In order to use the begin and duration into experiment plans, these are
moved from experiment settings to conditions (Closes #143).
Add a vle-1.2.0.dtd file.
Update template package by adding default simulation engine condition.
Update tests into vpz.
vle: switch from Gtkmm2 to Gtkmm3