Don't force F11 key binding (fullscreen mode)

F11 key binding is set by customization (eide-custom-key-f11) but is
also hard-coded. As a consequence, F11 toggles fullscreen mode even if
the key is customized with "Don't override".

Signed-off-by: Cédric Marie <cedric.marie@openmailbox.org>
Check Emacs version >= 24 in eide-start

The version used to be checked at installation time, but now Emacs-IDE
is distributed as a package, and it should be checked at run time.

The testing of XEmacs is removed. It is a package for Emacs and we
should not care about other usages.

Signed-off-by: Cédric Marie <cedric.marie@openmailbox.org>
Add URL in the package header

Since README.rst is not included in the package, it is useful to give
the URL of the project in the package header (in eide.el).

Signed-off-by: Cédric Marie <cedric.marie@openmailbox.org>
Version 2.0.0 (2014-05-15)

Signed-off-by: Cédric Marie <cedric.marie@openmailbox.org>